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Attention: RC-CAM.com will be closing down August 2021.

The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.

We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.

RC-CAM.com (main site and forum) will be closing down August 2021. This is being announced now (March 2021) so that everyone has time to download any information that is important to them. After the site is shutdown the information will no longer be available here.

We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.



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I made small OSD project. Currently it displays voltage of each cell from 3s. Voltage of cell below 3.19v starts blinking.

This circuit is plugged between camera and TV TX. In my LCD glasses I can see video with text data overlayed. I am planning to extent the device by displaying GPS data relative to the launch site (X, Y, alt.), and heading and distance to the site.

Maybe somebody can recommend a cheap (40-60$) GPS module with RS-232 or simpler connection ? :unsure:

Schematic: http://forum.rcdesign.ru/index.php?automod...=attach&id=4462

HEX, source: http://forum.rcdesign.ru/index.php?automod...=attach&id=4464

Video: http://forum.rcdesign.ru/index.php?automod...=attach&id=4465

Edited by Prikupets
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There are many low cost GPS OEM module choices. As a starting point, check out what sparkfun offers.

GPS NMEA parsing will be challenging due to the limited amount of RAM on the PIC16F676. But certainly possible with some careful coding.

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Thanks, I will check it out. Besides, I have only 540 bytes free and think about moving to some kind of 28-pin / 8k RAM PIC. Another choice is adding second PIC, which will prepare raw data to display by 1st PIC and link them by common memory or some kind of parallel communication. 2nd PIC will talk with GPS and stuff, 1nd will display.

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As for cheap gps modules, you may check what this shop offers

this shop. It's in Poland (PLN to USD exchange rate is 3.20:1). I have been thinking about buying one of them. Another option may be a PS/2 GPS mouse. They are quite a lot of them on auction sites and they are droping in prices since Bluetooth GPS receivers seem to gain in popularity.

As for OSD module. All seem to cost about 100 USD. I found one, which seems to have the most extensive capabilities.

It is called BOB4. See this link.

Maybe someone who had tried this or its earlier versions could write something?

You may also check these guys. This module seems quite robust but it is simpler than BOB4.

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