DHB-Jr2 (Dual H-Bridge Junior 2) Manual

DHB-Jr2 (Dual H-Bridge Junior 2) Manual
DHB-Jr2 (Dual H-Bridge Junior 2) Manual
Board Layout
Battery
Power
Connection
Switch
Motor
Motor
Connection 2
Connection 1 Connection
LED
(Power)
LED1
LED2
J1
J2
Setup
Button
Features
●
2 × motor drive
○
Most suitable for tank-drive system.
○
Operating current:
○
●
●
○
3A
○
6A (DHB-Jr2-DS)
4 to 8 cells (4.8V to 9.6V)
2 channels radio control servo signal interface
○
Throttle + steering. (DHB-Jr2, DHB-Jr2-DS)
○
Suitable for stick or pistol type transmitters.
○
Simple “neutral” position setting using setup button.
○
5V 500mA output for receiver and external circuit1.
Motor control
○
Proportional RC control up to 128 levels each in forward and reverse.
○
Quick motor direction change.
○
Brake in neutral position.
1 For 4 cells NiMH battery operation, output may be slightly lower than supply voltage.
Page 1 of 4
DHB-Jr2 (Dual H-Bridge Junior 2) Manual
Revision 1.0
Copyright © 2008, A-Main Objectives Pte Ltd
●
Interface
○
2 Channels RC servo signal.
(Channels from 1 to 4 in any combinations may be used.)
○
Supports simultaneous signals generated by microprocessor circuits.
○
Unit goes into fail-safe mode upon any missing signals.
○
Diagnostic LED visual indicators.
Setup: Connections
1. Connect J1 to receiver steering servo output.
2. Connect J2 to receiver throttle servo output.
3. Connect motors to left and right motors. Do not drive more than one motor from a
single motor output, this may cause damage to the DHB-Jr2.
4. DHB-Jr2 comes with a jumper across the power switch connection, and it can be
replaced by an on/off switch connected via a pair of wires terminated with appropriate
0.1” pitch header recepticals.
5. DHB-Jr2 comes supplied with RC-style JST red-coloured battery male connector.
When using non-RC standard or self-made cable, please observe polarity.
Connecting batteries with reverse polarity to DBH-Jr2 will damage it beyond repair.
6. Switch-on transmitter, then DHB-Jr2, and check that motors respond to transmitter
controls.
7. Trim transmitter controls for neutral setting or use setup button to program neutral
point.
LED indicators
Under normal operation:
LED
(Power)
LED1
LED2
Condition
Signals OK, both channels at neutral position.
Signals OK, channel 2 not in neutral position.
Signals OK, channel 1 not in neutral position.
Signals OK, channels 1 & 2 not in neutral position.
Fail-safe mode, no signals.
Fail-safe mode, channel 2 signal absent.
Fail-safe mode, channel 1 signal absent.
Page 2 of 4
DHB-Jr2 (Dual H-Bridge Junior 2) Manual
Revision 1.0
Copyright © 2008, A-Main Objectives Pte Ltd
Legends:
- Off or dimmed
- On
- Blinking
Setup: Programming Neutral Position
If neutral position cannot be achieved using the trim setting on the transmitter, follow the
steps below:
1. Power off controller board and transmitter.
2. Connect to receiver, e.g.,
Receiver
DHB-Jr
Channel 1 / Throttle
Channel 1
Channel 2 / Steering
Channel 2
3. Switch on transmitter, and set controls and trim to neutral position.
4. Press and hold setup button while applying power to DHB-Jr2.
5. LEDs will light up in the following sequence:
LED
(Power)
LED1
LED2
Status
Start setup.
Scanning channel 1.
Scanning channel 2.
Setup done.
Button may be released when start setup sequence is observed.
6. Further fine tuning can be done on transmitter trim setting.
Page 3 of 4
DHB-Jr2 (Dual H-Bridge Junior 2) Manual
Revision 1.0
Copyright © 2008, A-Main Objectives Pte Ltd
Setup: Motor Direction
If vehicle is not moving in desired direction, follow the chart below to correct setting.
Throttle
Steering
Vehicle
Behaviour
Correction
Forward
-
Reverse.
Forward
-
Turn clockwise
Exchange right motor connection
wires.
Forward
-
Turn counterclockwise
Exchange left motor connection wires.
Forward
Right
Move forward & Change steering 'servo reverse'
left
direction on transmitter.
Forward
Left
Move forward & Change steering 'servo reverse'
right
direction on transmitter.
Change throttle 'servo reverse'
direction on transmitter..
If neutral position cannot be achieved using the trim setting on the transmitter after
changing any channel 'servo reverse', follow the steps in Setup: Programming Neutral
Position.
Page 4 of 4
DHB-Jr2 (Dual H-Bridge Junior 2) Manual
Revision 1.0
Copyright © 2008, A-Main Objectives Pte Ltd
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