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GPS Video Overlay Boards
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| Our GPS video overlay boards provide a simple method for generating a display of GPS data over a video camera’s
composite video signal. They are ideal for people who want to build systems including video overlays for applications
such as RC aero modelling. They are also suitable for people who simply want to use their own enclosures. All versions
of the board carry an extremely high efficiency switch mode regulator making them ideal for battery powered applications.
The GPS video overlay boards operate in the same way as the GPSBOX unit. The GPSBOARD
version is designed to be connected to self contained gps receivers with either an NMEA 0183 RS232 or 5V TTL interface.
The GPSMOD-FVM version carries a supercap to provide backup power to maintain the real time clock, last fix position
and satellite data of either the FV-M8 or FV-M11 gps receiver modules. These receivers have integrated antennas
and allow the creation of a small, low cost overlay systems. To use the boards you will need to make connections
for the control buttons, video in, video out and power as described on the GPS board
connections page. |
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| The GPSBOARD-RS232 unit can be used with any GPS receiver with NMEA 0183 RS232 serial output. 1Hz 4800 baud 8N1.
The TTL version is for receivers with 5V TTL output. |
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GPSBOARD-RS232, GPSBOARD-TTL
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| GPSBOARD is available in two versions. GPSBOARD-RS232 is designed for connection to GPS receivers with RS232 output.
It is suitable for use with most handheld and other receivers which can be directly connected to a PC serial port.
The GPSBOARD-TTL version is for connection to receivers with a 5V TTL level serial output. Please note that this
version will not work with receivers that transmit serial data at TTL levels, but in RS232 format, i.e. voltage
low for logic high. For example the Garmin LV units. It is not compatible with receivers where the output logic
high level is 2.85V. |
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| The GPSMOD-FVM version of our GPS board is designed for use with the 5Hz GPS OEM receiver modules from San Jose
Navigation. Based on the latest 32 channel MTK chipset, their compact, advanced design is ideal for aero modellers
and UAV builders who want to add a GPS receiver to their design in conjunction with a video overlay. The GPSMOD-FVM
board is available either separately or in a combination with each of the two modules, which are also available
separately. The overlay board comes with a supercap to provide backup for the connected receiver's real time clock,
last fix position and satellite data. This back up allows the connected module to provide a faster hot or warm
start when the overlay board - module combination is powered up. A custom connector cable is provided to connect
the GPSMOD-FVM to the receiver module via a built in connector on the board. Please note that the connector on
the GPSMOD-FVM board is not compatible with the connection cable supplied with the FV-M8 and FV-M11. The connectors
on these two units are not pin compatible. |
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GPSMOD-FVM
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COMBO-FVM8, GPSMOD-FVM with San Jose Navigation FV-M8
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COMBO-FVM11, GPSMOD-FVM with San Jose Navigation FV-M11
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GPS Video Overlay Display Program
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The GPSMOD and GPSBOARD unit display options and ID string are selected using two push button controls. The button
connections are as described on the GPS board connections page. The character
background can be toggled on and off. The altititude display can be toggled between feet and metres. The speed
over ground display can be toggled between knots, kilometres per hour or miles per hour. The date can be shown
in either the standard DD/MM/YY format or the North American MM/DD/YY format. The time is displayed according to
a user selected timezone +/-12 offset from the GPS UTC time. You can select whether to display the data on either
line 1 only, lines 1 & 2 only, lines 1,2, & 3 only, all four lines or have the screen clear. See the video
clip above. You cannot display any other combination of lines, change on which line each data type is displayed
or change the position of the display on the screen. The character size and font also cannot be changed. Once set,
the user options remain stored in the unit until they are changed again. The unit has no other user controls. If
you require a rearrangement of the standard data positions, please contact us before you make your order and this
can be programmed for you. |
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| The screen display can be alternated between four lines of data, with or without a solid black background. Click
on each picture for larger version. |
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| The table below summarises the NMEA data sentences required by the GPS board unit together with the data types
and user selectable options it will display. The data format is standard NMEA 0183 RS232 at 4800 baud, 8 data bits,
no parity, 1 stop bit with a 1Hz update rate. You must ensure that the GPS receiver unit or module that you intend
to use transmits data in this format and with these sentences enabled. The data sentence setup is automatically
done for the EM-406 connected to the GPSMOD-EM. In this case the position, altitude and speed data sentences, GPRMC,
GPGGA and GPVTG are set to be always transmitted. Output of the satellite signal data sentences GPGSA and GPGSV
can be optionally enabled / disabled. The standard GPSMOD boards can be programmed with this set up routine for
use with any other Sirf chipset based receiver. By default no setup routine is used so you will need to ensure
that the module you intend to use transmits the required data sentences. |
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Data sentence required |
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Latitude |
$GPRMC |
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Longitude |
$GPRMC |
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Time ( User selected timezone offset ) |
$GPRMC |
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Date ( DD/MM/YY or MM/DD/YY format ) |
$GPRMC |
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Heading ( Track made good, degrees true ) |
$GPRMC |
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Speed over ground ( in knots, kph or mph* ) |
$GPRMC, $GPVTG |
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Altitude ( in metres or feet* above / below mean-sea-level (geoid) ) |
$GPGGA |
| *Calculated by the unit. Accurate to +/- 1. |
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| GPSBOARD GPSMOD specification |
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Compatible with colour and mono composite video signals. 1Vp-p. PAL and NTSC |
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Dimensions 60 x 54 x 20mm LxWxH |
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Weight approximately 25g dependent on button controls and connectors |
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Power supply required regulated 6.5 - 12V DC |
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Power consumption 50mA overlay board only. 120mA with FV-M8 or FVM11 |
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Operating Temp. 0° - 85°C |
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© The BlackBoxCameraTM Company Limited 2008
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