INSPIRE OSD
Installation Manual
Rev-D through Rev-E Hardware
INTRODUCTION:
INSPIRE is a GPS-based video system designed for
photography applications. Besides offering a
remote shutter interface for digital and film
cameras, it also provides detailed navigational
information. The realtime data is presented as a
text overlay on the user’s existing video camera
signal. In addition, the GPS data for each photo
can be stored for later review.
The applications for Inspire are extremely broad
and so the exact installation details will vary.
These instructions are best used as a basic
template on how to install the system. The installer
should have prior experience with similar video
Figure 2, Aerial Photo View
based equipment. If a R/C (radio control) system is
used with the Inspire system, then good experience with them is also required.
Installing and using the Inspire On-Screen Display (OSD) system requires technical skills and
safety-minded operation. Under no circumstances should the telemetry data be used as the
primary navigation resource. Never remotely operate any equipment unless you have direct
visual contact at all times and it is safe to do so. Use of the system is at your own risk.
BOARD PROTECTION
The Inspire board is protected by rugged fiberglass panels and a tough clear plastic covering.
However, in harsh environments it needs additional protection. Never expose it to moisture,
excessive temperatures, severe vibration, or high G-forces. Doing so will damage it and void the
warranty.
Mobile applications must use soft foam rubber padding to protect the board from vibrations. Use
enough padding to provide suitable protection. Model hobby shops sell this material for use in
mounting radio control (R/C) receivers, so they are often a convenient place to obtain it.
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MICRO GPS INSTALLATION
Begin by connecting the Micro GPS module to the Inspire
board using the short cable that is provided. The module is
installed on the top of the Inspire OSD module within the
outlined area marked “GPS” (see Figure 2).
A piece of 3M adhesive-back double sided foam tape should
be used for this. Once it is mounted, a piece of heat shrink
tubing, or several wraps of vinyl tape, should be used to
securely fasten the GPS module to the Inspire board.
Do not place the GPS module near a wireless video
transmitter or other strong RF sources. It should be aimed
towards the sky with minimal obstructions. If this cannot be
accommodated with the default mounting location then it
may be mounted on another nearby surface. It is also
possible to modify the GPS cable for longer lengths (up to
Figure 3, Micro GPS Installation
eight inches). However, this will require skillful soldering and
will void the warranty if assembly errors cause damage.
Figure 4, Geko Connection
GARMIN GEKO 201 GPS INSTALLATION
Instead of the micro-GPS module, the
popular Garmin Geko 201 GPS receiver
may be used (do NOT install both). The
Geko is connected to Inspire at the RS232 input (see Figure 4) using the
optional Garmin serial cable (p/n CABGEK-M). Or, a custom cable can be
created using our serial pigtail cable (p/n
CAB-SER-M) or a 4-pin Molex
#50-57-9404 connector (available at large
electronic component suppliers). A
custom cable will also need the special
GPS I/O connector that is available from
Garmin.
Figure 5.
The RS-232 4-pin connector wiring is as follows (see Figure 5):
Black Shield: Pin-1, GPS Signal Ground.
White Wire: Pin-3, GPS Data In.
Red Wire:
Pin-4, GPS Data Out.
Note: The wire colors found on the Garmin connector may vary.
Please confirm your connections using a continuity meter. To avoid
EMI/RFI interference issues, it is best to use shielded cable that is
as short as practical.
Figure 6.
The Garmin GPS must be set to the NMEA mode, 4800 baud. This
setting is found in its Setup->Interface->I/O format menu. Please consult the Geko 201
manual for full information.
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BATTERY INPUT CABLE
The battery input cable is equipped with a 2-conductor
female BEC-JST connector (see Figure 6). A matching male
cable is available separately.
Red wire:
Black wire:
6VDC to 14VDC battery power.
Ground (power return).
The battery input voltage range is 6VDC to 14VDC (185mA
typical). If the Inspire onboard voltage regulator will be used
to power an external 5VDC video camera then the input
voltage must not exceed 7.5VDC. A large capacity 5-cell
NiMH pack or 2-cell LiPO battery are fine for this task.
Figure 7, Batter Input Cable
Battery voltages under 5.6V cannot be used with Inspire.
Your battery choice must be able to provide sufficient voltage levels throughout its useful
discharge voltage range. Although the battery input is reverse-polarity protected, reversing the
power leads must be avoided.
The Inspire system may share the battery that is used by the other video equipment. However,
do NOT share battery power with radio systems or motor equipped circuits. Doing so may
cause significant EMI/RFI (electromagnetic interference) problems and adversely affect
operation.
AUX / MOTOR CURRENT SENSOR INPUT
At the top of the Inspire board are two short heavy gauge
wires. These are used to monitor DC current in highcurrent applications (up to ±75A DC). For example, the
current sensor could be used to monitor the motor current
of a hobby robot or small scale model vehicle.
The voltage should not exceed 40VDC. Please observe
standard safety
precautions when
working with high
capacity batteries.
The two sensor wires
must be installed in
SERIES with the load’s
power source. It is customary for the series connection to be
made on the positive lead of the battery. For example, to
measure the current on a brushed or brushless DC motor
that utilizes an electronic speed control, the leads would be
connected as seen in Figure 8.
Figure 8, Current Sensor
Figure 9, Typical Motor Circuit
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Please note that the current sensor’s wiring is installed *in series* with the motor circuit’s
battery. It is NOT wired in parallel. Do not attempt this installation unless you fully understand
the installation requirements.
If the “High” and “Low” wires are installed as shown, the displayed discharge current will be
shown as an unsigned number. However, if a negative labeled current is preferred, then merely
reverse the two connections (swap the High and Low leads).
The current monitor is best used with loads that are at least one amp. Monitoring lower currents
may not offer satisfactory operation due to the 250mA resolution of the current sensor.
AUX / MOTOR VOLTAGE MONITOR
The Aux/Motor voltage monitor can be installed
two different ways. If the current sensor is being
used, and you wish to monitor its voltage, then
install the V-Sel Jumper (see Figure 9). A ground
wire will need to be installed from the Inspire board
to the Aux/Motor battery.
Inspire’s factory clear plastic covering may need to
be trimmed to install the jumper. Once installed, it
is a good idea to place a piece of adhesive tape
over the cutout to ensure the jumper remains in
place.
Note: When the V-Sel jumper is installed the
companion VDC+ input connector must not be
used (see Figure 9, small circled area).
Figure 10, Aux/Motor Voltage Input
ALTERNATE AUX/MOTOR VOLTAGE MONITOR
The alternate Aux/Motor Voltage monitor method uses the “VDC+” and “Gnd” inputs (see
Figure 9, small circled area). This connector is a common 0.1" wide header and a variety of 2pin plugs are compatible with it.
When using the VDC+ input the V-Sel jumper must be removed (see Figure 9, large circled
area). The applied Aux/Motor voltage must not exceed 40VDC. Do NOT reverse the polarity
or severe damage will occur.
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RSSI VOLTAGE MONITOR
The RSSI voltage monitor is available at the “RSI+” and
“Gnd” input connector (See Figure 10). This connector is
a common 0.1" wide header and a variety of 2-pin plugs
are compatible with it.
The applied voltage must NOT exceed 5.0VDC. Do NOT
reverse the polarity or severe damage will occur.
Figure 11, RSSI Monitor Input
RS-232 GPS RECORD OUTPUT
The stored GPS records can be exported to a PC using the
RS-232 serial port (See Figure 11).
A fully assembled RS-232 cable is available. There is also a
3-wire pigtail for those that wish to add their own PC connector.
Or, a custom cable can be created using a DB-9 and a 4-pin
Molex #50-57-9404 connector. Wire it as follows:
Molex-1 to DB9-5
Molex-2 not used
Molex-3 to DB9-2
Molex-4 to DB9-3
Figure 12, RS-232 interface
The fully assembled RS-232 cable is ready to use. However, if
you have purchased the 3-wire pigtail, then connect it to a DB9 female as shown in Figure 12.
Figure 13, DB-9 Pinouts
BUFFERED NMEA SENTENCE OUTPUT
The GPS’s NMEA sentences are available for external use at the RS-232 Interface (see Figure
11). This serial output is enabled when the micro-GPS module or the Garmin Geko handheld
GPS is installed. The RS-232 pigtail (available separately) can be used if the white wire is move
from Molex pin-3 to pin-2. The cable pin out is then as follows:
Molex-2:
GPS NMEA Data
Molex-1:
Ground.
The communication parameters are 4800 baud, 8-bits, 1-stop, no parity.
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Video and Aux R/C Input Cables
There are two R/C servo cables labeled “Vid” and “Aux,” as
seen in Figure 13. They are not needed to use the OSD
system and may be omitted. However, if a R/C receiver is
installed, they can be used for remote operation of the OSD
video and the camera shutter.
The “Vid” (Video Control) channel cable is used to remotely
turn the OSD video on and off. A switch or stick controlled
R/C channel can be used for this. The on/off thresholds are
as follows:
1.6mS or Higher is Video On state
1.4mS or Lower is Video Off state
Figure 14, RC Input Cables
The Aux (Auxiliary Camera/Event) channel cable is used to remotely take photos or control
auxiliary circuitry. A switch or stick controlled R/C channel can be used for this. The SERVO
DIRECTION parameter (see USER MANUAL, Page 10) controls the Aux channel’s on/off
thresholds. The R/C signal thresholds are as follows:
NORM: 1.65mS or Higher is On state
1.57mS or Lower is Off state
REV: 1.35mS or Lower is On state
1.43mS or Higher is Off state
On PPM R/C systems the transmitter’s ATV/EPA and Dual Rate mixes should be adjusted so
that extreme servo pulse values fall within a range of 1.0mS to 2.0mS. Do not go below 1.0mS
or above 2.0mS.
For PCM or DSP based R/C systems, please ensure that the pulse values observe the same
restrictions as discussed above. However, the PCM’s failsafe should be set so that a lost R/C
signal causes the servo test screen to display ?Bad Pulse.” This will occur with failsafe servo
settings that are less than 0.85mS or greater than 2.15mS. Forcing such exaggerated servo
pulse values will allow the glitch counter to count failsafe events. Also, when using failsafe, the
R/C-Vid servo channel must be programmed to turn on the OSD video upon failsafe detection.
The two R/C inputs can be tested for proper operation using
Inspire’s System Setup menu (see Figure 14). Details to the
R/C Servo Test feature are discussed on Page 11 of the
USER MANUAL.
Figure 15, R/C Servo Test
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Shutter Control Servo Cable
The 3-pin female R/C connector provides a standard R/C signal
(see Figure 15). It can be used to control a hobby servo or
servo-compatible device.
Servo Cable Color Code:
Orange:
Servo Signal output, 1mS to 2mS.
Red:
Servo Power (4.8V to 6V DC required).
Brown:
Servo Ground.
Servo voltage is obtained from the two R/C input cables, which
are normally plugged into a battery powered R/C receiver. If a
servo is used without a receiver then a external battery must be Figure 16, Servo Cable
provided. Maximum allowed servo current draw is one amp.
The shutter servo cable is enabled when Inspire’s CAMERA
MODE entry is set to “Servo” (see Figure 16). When this entry
is chosen your shutter servo can be installed on the R/C
cable labeled “Shut”. If it is set to “Direct” the servo must be
removed.
Full details to configuring the Camera/Event features are
found in the USER MANUAL on page 10.
Figure 17, Servo Mode Selected
DIRECT CONNECT SWITCHED OUTPUT
The remote controlled switched output is labeled as Out+ and Out(See Figure 17). It is available when the Camera mode is
configured as “Direct.” This connector is a common 0.1" wide
header and a variety of 2-pin plugs are compatible with it.
The switched output can be setup to provide a 2-sec pulse upon a
timed event. It can also turn on/off using the R/C system. A typical
application is to use it to control the electric shutter on a film or
digital camera. It can also be interfaced to custom electronic
circuitry for application specific uses.
Figure 18, Direct Connect
It is an optically isolated electronic switch that can accept loads of up to 15VDC @ 10mA. Do
not exceed these limits. The switch is polarity sensitive; reversing the output may damage it.
Note: The special optically isolated output requires connecting a 2-wire cable to Out+ and Out-.
The 3-wire female servo cable cannot be used during the DIRECT mode.
The switch’s internal electrical configuration is
shown in Figure 18.
Figure 19, Switched Output Configuration
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TACHOMETER SENSOR
The optional tachometer sensor module is shown in Figure 19. It
plugs into Inspire at the 3-pin connector labeled “Tach” (Figure 20).
The actual sensor is a small IC (integrated circuit) at the face of the
tach board. It measures RPM by detecting the movement of nearby
miniature neodymium rare earth magnets. Although the magnets are
about the size of a pinhead, they are very powerful. One can be seen
in Figure 19, just below the tach board.
Figure 20, Tach Sensor
Two magnets are provided with each tach board. Pulling them
apart can be a challenge, but try to avoid using tools on them.
In a typical installation the magnets are carefully mounted 180°
apart on the rotating mechanics (i.e., wheel, non-ferrous shaft,
plastic hub or gear, etc.). The sensor board would be solidly
mounted on a fixed structure near the magnets.
Figure 21, Tach connector
The clearance between the magnet’s face, and the face of the
sensor IC, must be sufficient to prevent physical contact. But the
spacing must not exceed 2mm or magnet detection will be
unreliable.
The tach can measure up to 65,000 RPM. The number of
magnets that are used will determine the RPM count’s
resolution as follows:
1 Magnet : 60 RPM
2 Magnets: 30 RPM
3 Magnets: 20 RPM
4 Magnets: 15 RPM
5 Magnets: 12 RPM
6 Magnets: 10 RPM
Figure 22, Magnet Test
Before mounting the magnets you must identify the active
magnetic pole. To find the active pole, enter Inspire’s SYSTEM SETUP menu and go to the
FEATURE SETUP PAGE 5 screen (see Figure 21).
While observing the MAGNET COUNT entry, place the flat side of the magnet near the Tach
sensor IC. If necessary, flip it over. The side that echos the “i” character is the active pole.
Mark this side with a felt pen. It is the side that must face the tach sensor. If they are installed
backwards they will not work!
The magnets should be mounted flush with the surface. A shallow depression should be drilled
at each mounting location for this. To prevent the loss of the magnet during use, very strong
adhesive must be used to secure it. JB Weld epoxy works well and is stocked by hobby and
automotive stores.
Inspect the magnets for even spacing and balance to prevent vibration. Ensure that the sensor
board is securely fastened and that all wires are routed away from moving parts. Lastly, verify
that the MAGNET COUNT menu entry is set for the number of magnets that are installed.
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VIDEO CABLES
The input and output video cables are shown in Figure 22.
The female connector (left side) is Video-In and the male
connector (right side) is Video-Out. Mating pigtail cables are
provided with each system.
The cables are wired as follows:
Video-Input
Orange:
Video signal from camera.
Red:
Optional 5VDC power output. May be
used to power a low current 5V video
camera. See note below.
Brown:
Video Ground.
Figure 23, Video Cables
Video-Output
Orange:
Video signal to monitor or wireless video transmitter.
Red:
Optional 5VDC power output (normally not used). See note below.
Brown:
Video Ground.
Note: The video cable’s 5VDC power output may be used to power a low current video camera
or other accessory. If this option is used the battery input voltage must not exceed 7.5VDC. The
total combined current drawn from both cables must be less than 350mA. Otherwise,
overheating of the internal power supply will cause circuit stress and possible loss of video
during use. Do not use the 5VDC power output to operate high current accessories such as
wireless video transmitters.
EMI/RFI NOISE: TIPS FOR USING AN R/C SYSTEM WITH INSPIRE
R/C (radio control) systems are very sensitive to electromagnetic interference (EMI) and radio
frequency interference (RFI). EMI/RFI “noise” is undesirable because it reduces R/C operating
range and can cause unexpected servo behavior. Unfortunately, video systems and other
common sources generate EMI/RFI noise, so special installation care is needed to minimize
problems.
Interference issues can be investigated using the common R/C ground range test. Details to
this test are provided with the R/C system. If the ground range test does not pass the
manufacturer’s minimum recommended distance then the problem must be resolved before
using the video system. DO NOT USE THE SYSTEM IF THE TEST DOES NOT PASS.
Here are general tips for fighting EMI/RFI interference:
!
The video equipment must not share the battery that powers the R/C system or any
motor circuits.
!
Use a high quality double conversion R/C receiver. Do NOT use short-range designs.
!
Do not modify the receiver’s factory installed antenna. Use the full length (do not coil or
wrap it). Mount it far from the video system and GPS receiver.
!
Keep ALL cable lengths as short as possible. If they cannot be reduced in length, then
tightly bundle up any excess. Do not combine different cables in the bundles.
!
Install the video/GPS system as far from the R/C system as possible. A minimum of six
inches is recommended.
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Lastly, because the Inspire board is often plugged into the R/C receiver, it can act as a electrical
pathway for a variety of EMI/RFI interference sources. In cases where the R/C interference
cannot be resolved, Inspire may need to be unplugged from the R/C receiver to help restore
reliable R/C range.
Digital Products Company
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