Pololu RC Switch User`s Guide - Pololu Robotics and Electronics

Pololu RC Switch User`s Guide - Pololu Robotics and Electronics
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch User’s Guide
https://www.pololu.com/docs/0J60/all
Page 1 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1. Contacting Pololu . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. RC Switch with Digital Output . . . . . . . . . . . . . . . . . . . . . . . . .
2.1. Components of the RC Switch with Digital Output . . . . . . . . . . .
2.2. Connecting the RC Switch with Digital Output . . . . . . . . . . . . .
2.3. Schematic Diagram for the RC Switch with Digital Output . . . . . . .
3. RC Switch with Small Low-Side MOSFET . . . . . . . . . . . . . . . . . . .
3.1. Components of the RC Switch with Small Low-Side MOSFET . . . . .
3.2. Connecting the RC Switch with Small Low-Side MOSFET . . . . . . .
3.3. Schematic Diagram for the RC Switch with Small Low-Side MOSFET .
4. RC Switch with Medium Low-Side MOSFET . . . . . . . . . . . . . . . . . .
4.1. Components of the RC Switch with Medium Low-Side MOSFET . . . .
4.2. Connecting the RC Switch with Medium Low-Side MOSFET . . . . . .
4.3. Schematic Diagram for the RC Switch with Medium Low-Side MOSFET
5. RC Switch with Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1. Components of the RC Switch with Relay . . . . . . . . . . . . . . . .
5.2. Connecting the RC Switch with Relay . . . . . . . . . . . . . . . . . .
5.3. Schematic Diagram for the RC Switch with Relay . . . . . . . . . . . .
6. Pololu 4-Channel RC Servo Multiplexer . . . . . . . . . . . . . . . . . . . .
6.1. Components of the 4-Channel RC Servo Multiplexer . . . . . . . . . .
6.2. Connecting the 4-Channel RC Servo Multiplexer . . . . . . . . . . . .
6.3. Schematic Diagram for the 4-Channel RC Servo Multiplexer . . . . . .
7. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Outputs and Indicator LED . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Configuring Your RC Switch . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1. General Configuration Procedure . . . . . . . . . . . . . . . . . . . .
9.2. Restoring the Default Settings . . . . . . . . . . . . . . . . . . . . . .
9.3. Enabling Inversion . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Page 2 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
1. Overview
The Pololu RC switches allow you to turn devices on and off using standard radio control (RC) pulses.
These switches can be used with standard hobby RC systems for radio-controlled switch applications.
Example applications include using extra channels on an RC receiver or servo controller to turn on
lights, motors, or irrigation valves.
The RC switch measures the width of incoming RC pulses and compares it to a user-configurable
threshold (with ±64 µs of hysteresis) to decide whether to activate the switch. By default, the threshold
is approximately 1700 μs, with switch activation occurring above the threshold (longer pulses), but the
switch has a learning mode that allows you to change the threshold and the activation direction. A
safe-start feature reduces the likelihood of unexpected activation on all RC switches except the RC
Servo Multiplexer.
The RC Switch family
The Pololu RC Switch with Digital Output
[https://www.pololu.com/product/2801]
is the
most basic RC switch. This extremely compact (0.4″ × 0.4″) board can fit on a U.S.
dime and has two digital outputs that indicate whether the switch is active and whether
the input signal is valid. (These outputs are also available on all the other RC switches.)
The Pololu RC Switch with Small Low-Side MOSFET [https://www.pololu.com/product/
2802]
has an integrated low-side MOSFET that allows it to drive small loads (up to
around 3 A). It ships with male header pins included but not soldered in.
1. Overview
Page 3 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
The Pololu RC Switch with Medium Low-Side MOSFET
product/2803]
[https://www.pololu.com/
has an integrated low-side MOSFET that allows it to drive moderate loads
(up to around 15 A) and a voltage regulator that allows more options for powering the
board. The included screw terminal block makes it easy to connect the load and load
supply wires directly to the board. This RC switch ships with a 1×4 terminal block and
male header pins included but not soldered in.
The Pololu RC Switch with Relay [https://www.pololu.com/product/2804] features a singlepole, double-throw (SPDT) relay, allowing it to drive large, electrically isolated loads.
This board also has an integrated voltage regulator. It is available fully assembled
[https://www.pololu.com/product/2804] or as a partial kit [https://www.pololu.com/product/2805].
Please note that relays make a clicking sound when they are turned on or off, so the
RC Switch with Relay might not be suitable for applications requiring quiet operation.
The Pololu 4-Channel RC Servo Multiplexer
[https://www.pololu.com/product/2806]
is
an RC switch with an integrated quad 2-input multiplexer and a voltage regulator. It
allows easy switching of servo control between two independent sources. It is ideal
for applications in which you have two possible control sources and want to be able
to switch between them on the fly. The RC multiplexer is available fully assembled
[https://www.pololu.com/product/2806] or as a partial kit [https://www.pololu.com/product/2807].
In this guide, we use the term “RC switch” to refer to all members of the Pololu RC Switch family,
including the RC multiplexer.
Pololu RC Switch with Medium LowSide MOSFET on a breadboard.
1. Overview
The Pololu RC Switch with Relay
connected to a typical RC receiver.
Page 4 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Note: This guide does not apply to our older RC switches (products #721
[https://www.pololu.com/product/721],
#722
[https://www.pololu.com/product/722],
#752
[https://www.pololu.com/product/752],
#1210
[https://www.pololu.com/product/1210],
#1211
[https://www.pololu.com/product/1211]).
1.1. Contacting Pololu
We would be delighted to hear from you about any of your
projects and about your experience with the RC switch. You can
contact us [https://www.pololu.com/contact] directly or post on our
forum [http://forum.pololu.com/]. Tell us what we did well, what we
could improve, what you would like to see in the future, or
anything else you would like to say!
1. Overview
Page 5 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
2. RC Switch with Digital Output
2.1. Components of the RC Switch with Digital Output
Pololu RC Switch with Digital Output, labeled top view.
The Pololu RC Switch with Digital Output has 7 through holes spaced 0.1″ apart that fit 0.1″ header
pins.
RC interface
The GND, VRC, and RC IN pins make up the switch’s RC interface and can be connected directly to
an RC receiver or servo controller:
• The GND pin is the ground or reference voltage.
• The VRC pin connects to the RC power line. The power from VRC is not used by default,
but a jumper on the bottom of the board can be bridged with solder to power the board from
VRC.
• The RC IN pin is the RC signal input. The switch measures the width of pulses on this line
and uses that to decide whether to activate or not.
Power
2. RC Switch with Digital Output
Page 6 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
The VCC pin powers the basic functions of the board and needs
to be connected to a power source between 2.5 V and 5.5 V. The
VCC=VRC jumper on the bottom of the board can be bridged
with solder to power the board from VRC or to pass power from
VCC to the RC receiver.
Outputs and indicator LED
The RC switch provides feedback about what state it is in via a
yellow indicator LED. The LED behavior is described in Section
8. Status information is also provided by two outputs:
• The GOOD pin indicates the presence of a valid RC signal (10–330 Hz pulse rate,
0.5–2.5 ms pulse width).
• The OUT pin indicates whether the switch is active.
When these outputs are high they will be at the same voltage level as VCC. When low, these outputs
will be at 0 V (ground). These outputs do not have resistors in series with them. Each output can
source or sink up to 25 mA.
Configuration interface
The learning mode jumper on the top of the board can be used to get the device into learning mode
and configure it. The configuration procedure is described in Section 9.
Pololu RC Switch with Digital Output, bottom
view with dimensions.
Included hardware
A 7-pin 0.1″ straight breakaway male header [https://www.pololu.com/product/965] is included with the
2. RC Switch with Digital Output
Page 7 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Digital Output. The header pins can be soldered in and used to connect the RC
switch to perfboards or breadboards [https://www.pololu.com/category/28/solderless-breadboards].
Pololu RC Switch with Digital Output with
included hardware.
2.2. Connecting the RC Switch with Digital Output
The typical way to connect the Pololu RC Switch with Digital Output is shown in the diagram below:
Typical wiring diagram for the Pololu RC Switch with Digital Output.
The RC switch can be plugged directly into an RC receiver or servo controller using a FemaleFemale servo extension cable. These can be found in our Servo Cables [https://www.pololu.com/category/
112/servo-cables]
category. The switch will read the signal from the RC receiver, but in the default
configuration it will not draw or supply any power to the receiver, so the power wire is optional. The
receiver will need its own power source.
2. RC Switch with Digital Output
Page 8 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Power for the switch’s logic needs to be applied to GND and VCC and must be between 2.5 V and
5.5 V. Many microcontroller boards have a 3.3 V or 5 V line that powers the microcontroller and would
also be suitable for powering the RC switch.
The OUT line can be connected to a digital input pin on the microcontroller.
Power jumper
The setup described above involves two separate power supplies. For some applications, this setup
can be simplified by bridging the VCC=VRC power jumper on the bottom of the board. This allows you
to either power the microcontroller and RC switch from the RC receiver’s power supply or to power the
RC receiver and RC switch from the microcontroller’s power supply.
2.3. Schematic Diagram for the RC Switch with Digital Output
The schematic diagram of the Pololu RC Switch with Digital Output is shown below:
2. RC Switch with Digital Output
Page 9 of 45
Pololu RC Switch User’s Guide
This schematic is also available as a printable pdf
© 2001–2017 Pololu Corporation
[https://www.pololu.com/file/download/
pololu-rc-switch-with-digital-output-schematic-diagram.PDF?file_id=0J700]
2. RC Switch with Digital Output
(126k PDF).
Page 10 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
3. RC Switch with Small Low-Side MOSFET
3.1. Components of the RC Switch with Small Low-Side MOSFET
Pololu RC Switch with Small Low-Side MOSFET, top labeled view.
The Pololu RC Switch with Small Low-Side MOSFET has 11 through holes spaced 0.1″ apart that fit
0.1″ header pins.
RC interface
The GND, VRC, and RC IN pins make up the switch’s RC interface and can be connected directly to
an RC receiver or servo controller:
• The GND pin is the ground or reference voltage.
• The VRC pin connects to the RC power line. The power from VRC is not used by default, but
a jumper on the bottom of the board can be bridged with solder to power the board from VRC
as described below.
• The RC IN pin is the RC signal input. The switch measures the width of pulses on this line
and uses that to decide whether to activate or not.
Power
3. RC Switch with Small Low-Side MOSFET
Page 11 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
This board involves three potentially-different power supplies:
• VCC: The VCC pin powers the basic functions of the
board and needs to be connected to a power source
between 2.5 V and 5.5 V. VCC is also the gate voltage
that is used to turn the MOSFET on, so it should be noted
that lower VCC voltages will lead to higher MOSFET on
resistances, which in turn limits the maximum current the
device can switch.
• VRC: The VRC pin will generally be connected the power line from your RC system. By
default, power from this pin is not used by the board, so this pin is optional.
• LOAD HIGH: The two pins labeled LOAD HIGH will generally be connected to the positive
terminal of the load power supply and to the positive terminal of the load.
The bottom of the board has jumpers that can be bridged with solder in order connect VCC to VRC or
VCC to LOAD HIGH. These jumpers provide extra flexibility in how the system is powered, and some
examples are given in Section 3.2.
Load interface
The LOAD LOW and LOAD HIGH pins are connections for your load and load supply. The LOAD
LOW pins are normally disconnected from GND, but when the switch activates the MOSFET turns on
and connects LOAD LOW to GND. There is a flyback (also known as a “freewheeling”) diode between
LOAD LOW and LOAD HIGH. The board’s MOSFET can deliver up to 3 A with VCC at 5 V and can
handle load supply voltages up to 30 V. More details on connecting your load and load supply to the
switch can be found in Section 3.2.
Outputs and indicator LED
The RC switch provides feedback about what state it is in via a yellow indicator LED. The LED
behavior is described in Section 8. Status information is also provided by two additional outputs:
• The GOOD pin indicates the presence of a valid RC signal (10–330 Hz pulse rate,
0.5–2.5 ms pulse width).
• The OUT pin indicates whether the MOSFET is on.
When these outputs are high they will be at the same voltage level as VCC. When low, these outputs
will be at 0 V (ground). These outputs do not have resistors in series with them. Each output can
source or sink up to 25 mA.
3. RC Switch with Small Low-Side MOSFET
Page 12 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Configuration interface
The learning mode jumper on both the top and bottom of the board can be used to get the device
into learning mode and configure it. The configuration procedure is described in Section 9.
Pololu RC Switch with Small Low-Side MOSFET,
bottom view with dimensions.
Included hardware
A 12-pin 0.1″ straight breakaway male header [https://www.pololu.com/product/965] is included with the
Pololu RC Switch with Small Low-Side MOSFET. The header pins can be soldered in and used
to connect the RC switch to perfboards or breadboards [https://www.pololu.com/category/28/solderlessbreadboards].
3. RC Switch with Small Low-Side MOSFET
Page 13 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Small Low-Side MOSFET
with included hardware.
3.2. Connecting the RC Switch with Small Low-Side MOSFET
The typical way to connect the Pololu RC Switch with Small Low-Side MOSFET is shown in the
diagram below:
3. RC Switch with Small Low-Side MOSFET
Page 14 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Small Low-Side MOSFET, typical wiring diagram.
The RC switch can be plugged directly into an RC receiver or servo controller using a FemaleFemale servo extension cable. These can be found in our Servo Cables [https://www.pololu.com/category/
112/servo-cables]
category. The switch will read the signal from the RC receiver, but in the default
configuration it will not draw or supply any power to the receiver, so the power wire is optional. The
receiver will need its own power source.
Power for the board’s logic needs to be applied to GND and VCC and must be between 2.5 V and
5.5 V. A 5 V regulator would be a good choice for the logic power supply. A 3-cell NiMH battery pack
[https://www.pololu.com/category/104/3.6-v-nimh-battery-packs] would also work, but a 4-cell NiMH battery
pack can be well over 5.5 V when fully charged and would not be suitable.
The negative side of your load supply should connect to the GND pad on the top-right side of the
board, and the negative side of the load itself should connect to the LOAD LOW pin. The two pins
labeled LOAD HIGH are internally connected and will typically be connected to both the load and the
load power supply. There is a flyback (also known as a “freewheeling”) diode between the MOSFET
output and LOAD HIGH, which allows you to safely connect an inductive load such as a motor or
relay. Alternatively, the positive side of the load could be directly connected to the load supply off of
the board. The board’s MOSFET can deliver up to 3 A with VCC at 5 V and can handle load supply
voltages up to 30 V.
3. RC Switch with Small Low-Side MOSFET
Page 15 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Power jumpers
The setup described above involves three separate power supplies. For some applications, this setup
can be simplified by bridging one or both of the power jumpers on the bottom of the board.
Here are some alternative options for powering your system with fewer than three power supplies:
• If the VRC supply from the RC receiver is between 2.5 V and 5.5 V, then you could bridge the
VCC=VRC jumper in order to power the board from VRC and avoid the need for a separate
logic power supply connected to VCC. Alternatively, supplying power to VCC and bridging
VCC=VRC could allow you to power your RC receiver from the RC switch.
• If your load supply is between 2.5 V and 5.5 V, then you could bridge the VCC=load supply
jumper, allowing you to power the board from either the LOAD HIGH or VCC pin.
• With both jumpers bridged, the whole system can be powered from a single suitable source.
Large or capacitive loads can cause problems if the same supply is used for the logic (VCC)
and the load. In such a configuration, when the MOSFET turns on, VCC might drop below
2.5 V, causing the board to reset. If you try to activate the switch but the board just goes
into safe-start mode instead, you might have a power issue, especially if the problem only
happens when the load is connected. If you have this problem, you should consider using
a separate logic power supply, adding a capacitor between GND and VCC, or using shorter
power leads.
3. RC Switch with Small Low-Side MOSFET
Page 16 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
3.3. Schematic Diagram for the RC Switch with Small Low-Side MOSFET
The schematic diagram of the Pololu RC Switch with Small Low-Side MOSFET is shown below:
This schematic is also available as a printable pdf
[https://www.pololu.com/file/download/
pololu-rc-switch-with-small-low-side-mosfet-schematic-diagram.PDF?file_id=0J699]
3. RC Switch with Small Low-Side MOSFET
(143k PDF).
Page 17 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
4. RC Switch with Medium Low-Side MOSFET
4.1. Components of the RC Switch with Medium Low-Side MOSFET
Pololu RC Switch with Medium Low-Side MOSFET, labeled top
view.
The Pololu RC Switch with Medium Low-Side MOSFET has 12 smaller through holes spaced 0.1″
apart that fit 0.1″ header pins and four larger holes that fit 3.5 mm screw terminals.
RC interface
The GND, VIN, and RC IN pins make up the switch’s RC interface and can be connected directly to
an RC receiver or servo controller:
• The GND pin is the ground or reference voltage.
• The VIN pin is the power input.
• The RC IN pin is the RC signal input. The switch measures the width of pulses on this line
and uses that to decide whether to activate or not.
Power
The VIN pins power the basic functions of the board and need to be connected to a power source
between 2.5 V to 16 V. This allows the board to be powered from a 4- or 5-cell NiMH or NiCD battery
pack through an RC receiver or separately.
The VCC pin connects to the output of the onboard regulator and is 5 V when the board is powered
with a source that is greater than or equal to 5 V and approximately equal to VIN when it is below 5 V.
4. RC Switch with Medium Low-Side MOSFET
Page 18 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
VCC is also the gate voltage that is used to turn the MOSFET on, so it should be noted that lower
VCC voltages will lead to higher MOSFET on resistances, which in turn limits the maximum current
the device can switch.
Load interface
The LOAD LOW and LOAD HIGH pins are connections for your load and load supply. The LOAD
LOW pins are normally disconnected from GND, but when the switch activates the MOSFET turns on
and connects LOAD LOW to GND. There is a flyback (also known as a “freewheeling”) diode between
LOAD LOW and LOAD HIGH. The board’s MOSFET can deliver up to 15 A with VCC at 5 V and can
handle load supply voltages up to 30 V. More details on connecting your load and load supply to the
switch can be found in Section 4.2.
Outputs and indicator LED
The RC switch provides feedback about what state it is in via a yellow indicator LED. The LED
behavior is described in Section 8. Status information is also provided by two additional outputs:
• The GOOD pin indicates the presence of a valid RC signal (10–330 Hz pulse rate,
0.5–2.5 ms pulse width).
• The OUT pin indicates whether the MOSFET is on.
When these outputs are high they will be at the same voltage level as VCC. When low, these outputs
will be at 0 V (ground). These outputs do not have resistors in series with them. Each output can
source or sink up to 25 mA.
Configuration interface
The learning mode jumper on both the top and bottom of the board can be used to get the device
into learning mode and configure it. The configuration procedure is described in Section 9.
4. RC Switch with Medium Low-Side MOSFET
Page 19 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Medium Low-Side MOSFET,
bottom view with dimensions.
Included hardware
A 12-pin 0.1″ straight breakaway male header
[https://www.pololu.com/product/965]
and two 3.5 mm
2-pin terminal blocks [https://www.pololu.com/product/2446] are included with the Pololu RC Switch with
Medium Low-Side MOSFET. The header pins can be soldered in and used to connect the RC switch
to perfboards or breadboards [https://www.pololu.com/category/28/solderless-breadboards]. Please note that
the included terminal blocks are only rated for 10 A; for higher power applications, use thick wires
soldered directly to the board.
4. RC Switch with Medium Low-Side MOSFET
Page 20 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Medium Low-Side MOSFET
with included hardware.
4.2. Connecting the RC Switch with Medium Low-Side MOSFET
The typical way to connect the Pololu RC Switch with Medium Low-Side MOSFET is shown in the
diagram below:
4. RC Switch with Medium Low-Side MOSFET
Page 21 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Typical wiring diagram for the Pololu RC Switch with Medium Low-Side MOSFET.
An onboard regulator allows the switch to be powered from voltages between 2.5 V and 16 V.
However, for most applications we recommend using a 4- or 5-cell NiMH or NiCD battery pack to
power the switch. The battery pack will typically be connected to an RC receiver or servo controller
[https://www.pololu.com/category/102/maestro-usb-servo-controllers], which passes the power on to the RC
switch. The switch can be plugged directly into the RC receiver using a Female-Female servo
extension cable. These can be found in our Servo Cables
cables]
[https://www.pololu.com/category/112/servo-
category.
The negative side of your load supply should connect to the GND pad on the top-right side of the
board, and the negative side of the load itself should connect to the LOAD LOW pin. The four pins
labeled LOAD HIGH are internally connected and intended to give you convenient connection points
for both your load and your load power supply. There is a flyback (also known as a “freewheeling”)
diode between the MOSFET output and LOAD HIGH, which allows you to safely connect an inductive
load such as a motor or relay. Alternatively, the positive side of the load could be directly connected to
the load supply off of the board. The board’s MOSFET can deliver up to 15 A with VCC at 5 V and can
4. RC Switch with Medium Low-Side MOSFET
Page 22 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
handle load supply voltages up to 30 V.
For lower power applications the smaller 0.1″-spaced pins can be used instead of the terminal block
to connect the load and load supply.
Pololu RC Switch with Medium LowSide MOSFET with included terminal
blocks and headers soldered to the
component side.
Pololu RC Switch with Medium LowSide MOSFET on a breadboard.
4.3. Schematic Diagram for the RC Switch with Medium Low-Side
MOSFET
The schematic diagram of the Pololu RC Switch with Medium Low-Side MOSFET is shown below:
4. RC Switch with Medium Low-Side MOSFET
Page 23 of 45
Pololu RC Switch User’s Guide
This schematic is also available as a printable pdf
© 2001–2017 Pololu Corporation
[https://www.pololu.com/file/download/
pololu-rc-switch-with-medium-low-side-mosfet-schematic-diagram.pdf?file_id=0J684]
4. RC Switch with Medium Low-Side MOSFET
(156k pdf).
Page 24 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
5. RC Switch with Relay
5.1. Components of the RC Switch with Relay
Pololu RC Switch with Relay, labeled top view.
The Pololu RC Switch with Relay has five pins spaced 0.1″ apart that give access to its logic interface.
RC interface
The GND, VRC, and RC IN pins make up the switch’s RC interface and can be connected directly to
an RC receiver or servo controller:
• The GND pin is the ground or reference voltage.
• The VRC pin is the power input.
• The RC IN pin is the RC signal input. The switch measures the width of pulses on this line
and uses that to decide whether to activate or not.
Power
We generally recommend that you supply the GND and VRC pins with power from a 4- or 5-cell NiMH
or NiCD battery pack. Typically, the input voltage range will be limited by the properties of the relay
coil. The included Omron G5LE-14-DC5 relay requires an input voltage of at least 3.75 V to operate.
At room temperature (23° C), the relay can tolerate voltages up to 8.5 V, but this limit decreases at
higher temperatures. At 85° C, the relay can only tolerate voltages up to 6.5 V. You can see the Omron
G5LE-14-DC5 datasheet [https://www.pololu.com/file/download/G5LE.pdf?file_id=0J619] (1MB pdf) for more
information. As a whole, the switch will draw about 100 mA when the relay is on, but that current draw
depends on the input voltage. The board itself can operate anywhere in the 2.5 to 16 V range, but the
included Omron relay requires a more restrictive range of voltages.
5. RC Switch with Relay
Page 25 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Relay interface
The NO, NC, and COM pins are connected directly to the relay.
• NO stands for “normally open”. This pin is normally disconnected from the COM pin, but they
become connected when the relay is active.
• NC stands for “normally connected”. The NC pin is normally connected to the COM pin
through the relay, but they become disconnected when the relay is active.
• COM stands for “common”.
These pins are electrically isolated from the logic side of the board and are routed on the PCB with
a minimum clearance of 60 mils (1.5 mm) from other copper and from the board edges, though
manufacturing variations in the board edges can make those distances slightly lower.
In most applications, the current and voltage ratings for the module will match the ratings of the
relay used. Maximum current, maximum voltage, and life expectancy are interdependent; we therefore
recommend careful examination of your relay’s datasheet. If you are using the included relay, please
refer to the Omron G5LE-14-DC5 datasheet [https://www.pololu.com/file/download/G5LE.pdf?file_id=0J619]
(1MB pdf) for information.
Warning: The RC Switch with Relay is not designed to or certified for any particular highvoltage safety standard. Working with voltages above 30 V can be extremely dangerous and
should only be attempted by qualified individuals with appropriate equipment and protective
gear.
Outputs and indicator LED
The RC switch provides feedback about what state it is in via a yellow indicator LED. The LED
behavior is described in Section 8. Status information is also provided by two additional outputs:
• The GOOD pin indicates the presence of a valid RC signal (10–330 Hz pulse rate,
0.5–2.5 ms pulse width).
• The OUT pin indicates whether the relay is activated (i.e. the relay coil is energized).
When high, the GOOD and OUT outputs will output a voltage approximately equal to 5 V or VRC,
whichever is lower. When low, these outputs will be at 0 V (ground). These outputs have 220 Ohm
resistors in series with them to protect them from short circuits.
5. RC Switch with Relay
Page 26 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Configuration interface
The learning mode jumper can be used to get the device into learning mode and configure it. The
configuration procedure is described in Section 9.
Pololu RC Switch with Relay carrier board, labeled top
view.
Pololu RC Switch with Relay, bottom view with dimensions.
Included hardware
The Pololu RC Switch with Relay is available in two versions:
5. RC Switch with Relay
Page 27 of 45
Pololu RC Switch User’s Guide
• The assembled version
© 2001–2017 Pololu Corporation
[https://www.pololu.com/product/2804]
ships with the 5V Omron relay,
header pins, and terminal block soldered in. A 1×2-pin male header and a shorting block
are also included with the assembled version and can be used together as a tool when
configuring the device. The assembled version can be incorporated into an existing RC
system without the need for any additional soldering.
• The partial kit version [https://www.pololu.com/product/2805] gives you the flexibility to choose
different connections. It includes a 5V Omron relay, 0.1″ 12-pin male header, a 0.1″ 12-pin
right-angle male header, a 3-pin terminal block, and a shorting block. The headers can be
broken into smaller pieces and optionally soldered to the board, or wires can be soldered
directly to the board for the most compact installation.
Warning: When soldering the terminal block into the partial kit version, be sure to use
the larger set of holes. If you use the smaller holes, which are intended for 0.2″ male
header pins, there will not be enough space to mount the relay.
Pololu RC Switch with Relay
(Assembled) with included hardware.
Pololu RC Switch with Relay (Partial
Kit).
5.2. Connecting the RC Switch with Relay
The typical way to connect the Pololu RC Switch with Relay is shown in the diagram below:
5. RC Switch with Relay
Page 28 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Typical wiring diagram for the Pololu RC Switch with Relay.
We generally recommend that you use a 4- or 5-cell NiMH or NiCD battery pack for the logic power
supply. The power supply will typically be connected to the RC receiver, which passes the power on
to the RC switch. The switch can be plugged directly into the RC receiver using a Female-Female
servo extension cable. These can be found in our Servo Cables [https://www.pololu.com/category/112/
servo-cables]
category.
One typical way of connecting the relay is to put it between the load and the positive terminal of the
load’s power supply. The load is the device that you want to control with the RC switch. The negative
terminal of the power supply should connect to the other side of the load. The negative terminal of
the power supply does not necessarily need to be connected to the GND pin of the logic side. In the
diagram above, the positive terminal of the load power supply is connected to the NO pin and the
positive terminal of the load is connected to COM. They will normally be disconnected, but when the
switch turns on, the relay will activate and connect the two, allowing the load to be powered.
5. RC Switch with Relay
Page 29 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
The Pololu RC Switch with Relay connected to a typical RC
receiver.
5.3. Schematic Diagram for the RC Switch with Relay
The schematic diagram of the Pololu RC Switch with Relay is shown below:
5. RC Switch with Relay
Page 30 of 45
Pololu RC Switch User’s Guide
This schematic is also available as a printable pdf
© 2001–2017 Pololu Corporation
[https://www.pololu.com/file/download/
pololu-rc-switch-with-relay-schematic-diagram.pdf?file_id=0J682]
5. RC Switch with Relay
(165k pdf).
Page 31 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
6. Pololu 4-Channel RC Servo Multiplexer
6.1. Components of the 4-Channel RC Servo Multiplexer
Pololu 4-Channel RC Servo Multiplexer (Assembled),
labeled pinout.
RC interface
The Pololu 4-Channel RC Servo Multiplexer has a total of 13 RC servo channels:
• The four inputs M1–M4 are called the master inputs.
• The four inputs S1–S4 are called the slave inputs.
• The four outputs OUT1–OUT4 are the main outputs of the device.
• The signal on the SEL input channel determines whether the outputs map to the master
inputs or the slave inputs.
This guide uses the terms active, activated, and activation to refer to the active state of the switch. For
the RC multiplexer, active means that the outputs reflect the slave inputs. By default, the switch will
not be active and the master inputs will show up on the outputs.
Each servo channel consists of three pins: GND, power, and signal. As shown in the diagram above,
the GND (ground) pins are on the edge of the board and the power pins are in the middle between
GND and signal. All ground pins are internally connected on the board.
6. Pololu 4-Channel RC Servo Multiplexer
Page 32 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
When the RC signal on the SEL channel is lost or invalid, the optional FAILMODE jumper determines
the output behavior. If the jumper is left off, the master inputs will be in control. If the jumper is
connected, the output channels go low and stay low for as long as the signal on the SEL channel
remains invalid. For many servos and electronic speed controls (ESCs), a constant low on the signal
line will turn them off, which might be desirable if the control signals are known to be bad.
Note that SEL is the only input that requires a valid RC servo signal (10–330 Hz pulse rate, 0.5–2.5
ms pulse width); the master and slave inputs can be general digital signals. For example, you could
use OUT4 to control the brightness of a small (< 20 mA) LED by sending PWM signals to the inputs
on S4 and M4.
Power
The power supplied by the master RC device should be between 2.5 and 16 V, and it must be capable
of supplying the current that the servos connected to the outputs draw. The power pins of the SEL,
M1–M4, and OUT1–OUT4 channels are all connected to the same VM rail, and the board draws its
power from those pins. The power pins of the S1–S4 inputs are connected to each other on the VS
rail but are not used by the board.
Additional outputs and indicator LED
The yellow indicator LED indicates what state the switch is in. The LED behavior is described in
Section 8.
The FAILMODE jumper consists of two pins that might be individually useful to advanced users:
• The FAILMODE pin with the octagonal pad (the one closer to the edge of the board) is the
GOOD output. This output is low when signal on the SEL input is valid, and high when the
signal on the SEL input is invalid or missing.
• The other FAILMODE pin is the EN input. This input is pulled low by default. When this input
is driven high, it disables all of the output channels, causing them to go low (0 V) and stay
low.
The RC multiplexer has an internal signal named OUT that indicates whether the switch is activated or
not. The OUT signal is high when the switch is active and is low otherwise. This signal is not accessible
on any through-hole pin but you can access it by finding the 16-pin chip and soldering a wire to the pin
1, which is the pin that is closest to the OUT1 channel.
When high, all the output signals on the device will output a voltage approximately equal to 5 V or
VM, whichever is lower. When low, these outputs will be at 0 V (ground). These outputs do not have
resistors in series with them. Each output can source or sink up to 25 mA.
6. Pololu 4-Channel RC Servo Multiplexer
Page 33 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Configuration interface
The learning mode jumper can be used to get the device into learning mode and configure it. The
configuration procedure is described in Section 9.
Pololu 4-Channel RC Servo Multiplexer, bottom view with
dimensions.
Included hardware
The Pololu 4-Channel RC Servo Multiplexer is available in two versions:
• The assembled version
[https://www.pololu.com/product/2806]
ships with the headers pins
soldered in to every through-hole except the extra slave power connection pins, as shown
in the left picture below. A shorting block is included for optional use with the FAILMODE
jumper pins. The assembled version can be incorporated into an existing RC system without
the need for any additional soldering. The header pin spacing is the same as on standard RC
receivers, so the board works directly with standard hobby RC servos [https://www.pololu.com/
category/23/rc-servos]
and servo cables [https://www.pololu.com/category/112/servo-cables].
• The partial kit version [https://www.pololu.com/product/2807] gives you the flexibility to choose
different connections. It includes a shorting block and two 1×25-pin male headers. These
strips can be broken into smaller strips and soldered to the board, or wires can be soldered
directly to the board for the most compact installation.
6. Pololu 4-Channel RC Servo Multiplexer
Page 34 of 45
Pololu RC Switch User’s Guide
Pololu 4-Channel RC Multiplexer
(Assembled).
© 2001–2017 Pololu Corporation
Pololu 4-Channel RC Servo Multiplexer
(Partial Kit) with included hardware.
6.2. Connecting the 4-Channel RC Servo Multiplexer
The RC multiplexer pins are spaced 0.1″ apart so the servo inputs can be plugged directly into an
RC receiver or servo controller using a Female-Female servo extension cable. These can be found
in our Servo Cables [https://www.pololu.com/category/112/servo-cables] category. The column of pins along
the outside edge of the board is GND (ground) and the column in the middle is power.
We recommend that you connect the SEL and M1–M4 inputs to a single “master” RC device, such
as an RC receiver or servo controller. The master device should have a power source that supplies
power the RC multiplexer. The power supplied by the master should be between 2.5 and 16 V and it
must be capable of supplying the current that the servos connected to the outputs draw.
We recommend that you connect the S1–S4 inputs to a single “slave” RC device, such as an RC
receiver or servo controller. The slave device will need a source of power. You can either connect the
slave power directly to the slave device or you can connect it to the GND/VS pin pair next to S1.
The OUT1–OUT4 outputs can be directly connected to standard RC servos.
The master RC device can use the SEL line to select which device controls the outputs. When the
switch is active, the signal received on S1 will be reflected on OUT1, so a device sending pulses to S1
can control a servo or ESC connected to OUT1. When the switch is not active, OUT1 will reflect the
input on M1. The same applies to channels 2–4.
6.3. Schematic Diagram for the 4-Channel RC Servo Multiplexer
The schematic diagram of the 4-Channel RC Servo Multiplexer is shown below:
6. Pololu 4-Channel RC Servo Multiplexer
Page 35 of 45
Pololu RC Switch User’s Guide
This schematic is also available as a printable pdf
© 2001–2017 Pololu Corporation
[https://www.pololu.com/file/download/
pololu-4-channel-rc-servo-multiplexer-schematic-diagram.pdf?file_id=0J701]
6. Pololu 4-Channel RC Servo Multiplexer
(210k pdf).
Page 36 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
7. Functional Description
This section documents the functions and behavior of the RC switch. The information in this section is
not needed to use the device, but it might be helpful if you are curious about the details.
Timing accuracy
The timing accuracy of the RC switch is limited by its internal clock, which has an accuracy of ±2%.
Because of this, the threshold and other timing parameters might vary by a few percent.
Configuration parameters
The device stores two user-settable configuration parameters: threshold and inversion.
The threshold parameter is a pulse width that can range from 900 to 2100 μs and must be a multiple
of 16 μs. The default threshold is 1696 μs.
The inversion parameter can either be enabled or disabled. When inversion is disabled, the pulses
have to be above the threshold in order to activate the switch. When inversion is enabled, the pulses
have to be below the threshold in order to activate the switch. By default, inversion is disabled.
Pulse measuring
The device measures standard RC pulses on its RC input (which is labeled RC IN or SEL depending
on the device). It is designed to have strict requirements for the signal and to deactivate itself as soon
as possible when those requirements are not met. The device expects the pulses to have a width
within 500 to 2500 μs and a frequency within 10 to 333 Hz. These limits cannot be strictly enforced
because of the ±2% clock accuracy, but the device is designed to accept any signal that is within these
limits. If there has been no activity for 130 ms, the signal is considered to be bad. If there have been
too many glitches detected on the RC input, the signal is considered to be bad.
The device requires three good pulses in a row before it will consider the signal to be good. However,
as soon as the signal violates any of the rules above, it will consider the signal to be bad and
deactivate the switch.
When comparing the measured pulse width to the threshold to determine whether the pulses are
above or below the threshold, the device uses a hysteresis of ±64μs.
Safe-start
All of the RC switches except the Pololu 4-Channel RC Servo Multiplexer have a safe-start feature that
reduces the likelihood of unexpected activation. Safe-start mode is active at power up, and while the
safe-start mode is active, the switch does not activate. The device deactivates safe-start mode when
the signal is good and it receives a pulse in the off position. The device will re-activate safe-start mode
if the signal is bad continuously for 500 ms.
7. Functional Description
Page 37 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
If the device is receiving a valid RC signal which suddenly stops, it will take 130 ms before the signal
is recognized as bad. From there, it will take 500 ms before the safe-start mode becomes active, so
there will be a total of 630 ms between the loss of the signal and the re-activation of safe-start mode.
To get out of safe-start mode and activate the switch, you should move the input to the off position and
then move it to the on position.
Even with the safe-start feature, unexpected activation of the switch is still possible. With the
Pololu RC Switch with Relay, one way this could happen is if the switch is activated but the
logic power supply is at 3 V, which is too low to actually turn on the relay. If the logic power
rises from 3 V to 5 V then the relay could turn on unexpectedly.
7. Functional Description
Page 38 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
8. Outputs and Indicator LED
The OUT pin is an output that indicates whether the switch is active. A high value means the switch is
active, and a low value means it is not active. The OUT pin is high whenever the integrated MOSFET
or relay is turned on. The Pololu 4-Channel RC Multiplexer does not have an OUT pin, but the same
signal could be accessed by soldering a wire to the board as described in Section 6.1.
The GOOD pin is an output that indicates whether the signal is valid (10–330 Hz pulse rate,
0.5–2.5 ms pulse width). When the GOOD pin is low, it means the signal is invalid. In that situation, the
OUT pin will also be low. The RC multiplexer does not have a GOOD pin, but it does have an inverted
GOOD pin as described in Section 6.1.
The yellow indicator LED shows what state the device is in. There are four states the device can be
in during normal operation:
• If there is no input signal, the LED will blink with a 50% duty cycle and a period of 1 s. In this
case, the OUT and GOOD pins will be low.
• If the pulses are in the on position but the switch is not active because safe-start mode is
active, the LED will do a double-blink with a period of 1 s. In this case, the OUT pin will be
low and the GOOD pin will be high.
• If the pulses are in the off position, the output will be off and the LED will do a brief blink once
per second. In this case, the OUT pin will be low and the GOOD pin will be high.
• If the pulses are in the on position and the output is on, the LED will be mostly on and blink
off briefly once per second. In this case, the OUT and GOOD pins will be high.
If the power supply voltage drops too low, the device will detect this and stop running. This is called a
brown-out reset. After the power supply voltage recovers (which could be a few milliseconds later), the
device will suspend normal operation briefly and do a special LED blink. The blink consists of a single
blink followed by a double blink, with a period of 7/8 s and three repetitions.
During learning mode, the LED exhibits several other types of blinking. These are documented in
Section 9.
8. Outputs and Indicator LED
Page 39 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
9. Configuring Your RC Switch
The RC switch has two user-settable configuration parameters, threshold and inversion, which are
described in Section 7. This section and the following sections explain how to set both parameters.
To configure the device, you will need to be able to connect and disconnect the two parts of the
learning mode jumper. This will be required at several points by the instructions in the following
sections.
Pololu RC Switch with Digital
Output, labeled top view.
For the Pololu RC Switch with Digital Output, the learning mode jumper consists of a pair of
exposed pads on the component side of the board. To connect the two pads, you can use a wire,
screwdriver, or some other conductive tool.
Pololu RC Switch with Small Low-Side MOSFET,
top labeled view.
For the Pololu RC Switch with Small Low-Side MOSFET, the learning mode jumper consists of
a pair of exposed pads on the component side of the board. An alternate learning mode jumper is
available on the other side of the board and is labeled “LRN”; you can use whichever jumper is more
convenient. To connect the two pads, you can use a wire, screwdriver, or some other conductive tool.
9. Configuring Your RC Switch
Page 40 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Medium Low-Side MOSFET,
labeled top view.
For the Pololu RC Switch with Medium Low-Side MOSFET, the learning mode jumper consists of
a pair of exposed pads on the component side of the board. An alternate learning mode jumper is
available on the other side of the board and is labeled “LRN”; you can use whichever jumper is more
convenient. To connect the two pads, you can use a wire, screwdriver, or some other conductive tool.
Connecting a 1×2-pin male header to a blue
shorting block makes a tool that can be used to
activate the learning mode on the Pololu RC
Switch with Relay.
9. Configuring Your RC Switch
Page 41 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu RC Switch with Relay, labeled top view.
For the Pololu RC Switch with Relay, the learning mode jumper consists of two holes. You could use
a wire to connect the two holes, but we recommend inserting a 1×2-pin male header into the included
blue shorting block and using that as a tool to connect the two holes. The assembled version of the
switch comes with a 1×2-pin male header. If you have the partial kit version, you can break two pins
off of the included male header to get a 1×2-pin piece. To make the contact, stick the two exposed
pins into the two holes of the learning mode jumper and then tilt the tool towards the side and press
on it to ensure a good connection with the inside edge of each hole. It is not sufficient to just rest the
tool on the learning mode jumper; you must tilt it and apply some force.
9. Configuring Your RC Switch
Page 42 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
Pololu 4-Channel RC Servo Multiplexer (Assembled),
labeled pinout.
For the Pololu 4-Channel RC Servo Multiplexer, the learning mode jumper consists of a pair of
exposed pads on the component side of the board. An alternate learning mode jumper is available on
the other side of the board and is labeled “LEARN”; you can use whichever jumper is more convenient.
To connect the two pads, you can use a wire, screwdriver, or some other conductive tool.
9.1. General Configuration Procedure
This is the general procedure for configuring the device. To follow these instructions, you will need to
know how to connect and disconnect the learning mode jumper, as described in Section 9.
1. Get the device into learning mode. In order to do this, power off the device, connect the
learning mode jumper, and then power it on. After it is powered on, disconnect the learning
mode jumper. At this point, you will see the indicator LED fading in and out with a period of
1 second. Your device is now in learning mode, and will be until you next turn off the power.
In learning mode, it will not turn on the relay. If you want to abort learning mode, you can
power off the device at this point and none of your settings will change.
2. Tap the learning mode jumper (connect it and then disconnect it). This restores all of the
settings in the device to their default values; the threshold will be 1696 μs and inversion will
be disabled. The indicator LED should be blinking a different pattern now. If you want to use
the default settings and exit learning mode, you can power off the device at this point and
skip the instructions below.
9. Configuring Your RC Switch
Page 43 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
3. Now the device is in the pulse-measuring phase of learning mode. This is where you can
choose what threshold to use.
◦ If you want to use the default threshold, you should not send RC pulses to the
device. The device will indicate that the RC input signal is not recognized by blinking
the LED with a 50% duty cycle and a period of 0.5 s.
◦ If you want to use a custom threshold, you should send RC pulses to the device. The
device will indicate that it recognizes the RC input signal by blinking the LED with
a special pattern that consists of a fade in followed by a blink, with a period of 2 s.
The device will calculate the minimum and maximum pulse widths seen during this
phase of learning mode, and set the threshold equal to the point midway between
them (the average). In general, we recommend moving your input to both the off
position and the on position during this phase of learning mode, and not moving it
anywhere outside of that range. However, if you are using a servo controller to send
pulses, you might want to simply send pulses equal to the desired threshold. If you
accidentally send incorrect pulses, you will have to power off the device and start
over at step 1.
4. Tap the learning mode jumper again to save the chosen threshold. If the threshold you chose
was not within the allowed range of 900 to 2100 μs, then the device will indicate an error by
blinking the LED rapidly eight times per second. If that error happens, the threshold will not
be saved and you should power off the device and try the procedure again with a different
threshold. If the threshold you chose was within the allowed range, then it will be saved to
non-volatile memory and you will see the LED fade in repeatedly with a period of 1 s.
5. You can now chose whether to enable inversion. If you do not want to enable inversion,
simply power off the device now to exit learning mode. If you do want to enable inversion, tap
the learning mode jumper again. The LED will start fading out repeatedly with a period of 1 s.
6. Power off the device to exit learning mode. Your learning mode jumper connection should be
removed at this point. The settings you chose have been saved in non-volatile memory of the
device and you can power it on to use the new settings.
9.2. Restoring the Default Settings
This section gives steps for restoring the switch to its default settings. This is a good thing to try if you
have any trouble using the switch. The general configuration procedure is documented in Section 9.1,
but the instructions here are easier to follow if you just want to restore the device to its default settings.
To follow these instructions, you will need to know how to connect and disconnect the learning mode
jumper, as described in Section 9.
1. Get the device into learning mode. In order to do this, power off the device, connect the
learning mode jumper, and then power it on. After it is powered on, you should disconnect
9. Configuring Your RC Switch
Page 44 of 45
Pololu RC Switch User’s Guide
© 2001–2017 Pololu Corporation
the learning mode jumper. At this point, you will see the indicator LED fading in and out with
a period of 1 second.
2. Tap the learning mode jumper (connect it and then disconnect it). The indicator LED should
be blinking a different pattern now.
3. Power off the device to exit learning mode.
After following these instructions, the threshold should be 1696 μs and inversion should be disabled.
9.3. Enabling Inversion
This section gives steps for enabling inversion while still using the default threshold of 1696 μs. The
general configuration procedure is documented in Section 9.1, but the instructions here are easier to
follow if you just want to enable inversion and are happy with the default threshold value. To follow
these instructions, you will need to know how to connect and disconnect the learning mode jumper, as
described in Section 9.
1. Since you don’t want to set the threshold, you should stop sending RC pulses to the device. If
you are controlling the switch with an RC receiver, you might need to power off the transmitter
and power cycle the receiver. If possible, you could just disconnect the wire going to the RC
IN pin.
2. Get the device into learning mode. In order to do this, power off the device, connect the
learning mode jumper, and then power it on. After it is powered on, you should disconnect
the learning mode jumper. At this point, you will see the indicator LED fading in and out with
a period of 1 second.
3. Tap the learning mode jumper (connect it and then disconnect it). The indicator LED should
be blinking with a 50% duty cycle and a period of 0.5 to indicate that there is no signal being
received. If you see it doing a pattern where it fades in and then blinks, then you are still
sending pulses to the device. You should figure out how to stop sending pulses, and start
over at step 1.
4. Tap the learning mode jumper again. The LED should now be fading in repeatedly with a
period of 1 s.
5. Tap the learning mode jumper again. The LED should start fading out repeatedly with a period
of 1 s.
6. Power off the device to exit learning mode.
9. Configuring Your RC Switch
Page 45 of 45
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