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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.



Xygax

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About Xygax

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  1. Ok i understand that so move it from a 508 to a 629 or similar that has a capture module. Sample an incoming video signal using the frame pulse and interval with the capture module and hold off the rest of the code until it senses a frame period too long or loss . Then it could replace the signal seamlessly using an analouge switch. After it it sees the return of the frame pulse and period (one or two whole frames 40mS) then it can switch back to the incoming video signal. The circuit is quite simple. Feed the composite video into the comparator useing a low reference voltage (so it only g
  2. I have been thinking about this and did a little research http://www.atv-projects.com/50p_SPG.html This is a litle generator that can be used to prove either way whether the sync is the 'keep alive' signal that blocks the blue screen and if so then there should be a way of remodeling the code on this chip to sync to an incoming sync pulse on one of the spare pins. Ok it may meen using a chip that can run at 8Mhz to make the timing work but its entirly posible to use a little micro to generate a phase locked sync signal and at worse you will see a frame roll as it locks this may be prefe
  3. This is a theroy rather than a proven way foward... I think that most monitors monitor the sync pulse and this is the key to them staying on (computer monitor is clasic esample) when the sync disapears the monitor starts the shutdown / loss of signal process. This can be reasonably simple to prove. Take a monitor that uses RGB + Sync... remove one at a time the r...g...b and look for the black screen... or take away the sync and see the blue screen... I remember the device that generated sync pulses was a ZNA134 or later a ZNA234 this could be locked to the incoming sync so that it
  4. Steven: The lowest cost option is going to be the pickit 2 or 3 MAplins or microchip direct STeve (in brstolium)
  5. The conventional way to run a series LED stack is a small switch mode (30w from 12v is a flyback) these are normally run in current mode with upper voltage limit about 0.3-0.5v above the upper led stack voltage. probably simplest with a 3842 and an irf530 and a quality 10 A shoktty diode would be about right for this type of application it would reject the varation in bike battery voltage completly and provide a constant current to the load from 9 - 16 v and they are 80+% efficent ... Steve
  6. OK. Make the comparator -ve the RC input and put aabout 2.5v from Vref. (that coveres the 3.3v outputs from some RX's) connect the comparator out to a pin and then via a resistor (1 k ish) to the capture compare input. (you can also put a switch to -ve here if you need a program input) The comparator removes any rubbish on the edges and is a universal level converter. so at the input to the ccp module you have a good clean 5v signal (a bonus is you can also put a scope on it to see when you havent turned the Vref on !!!) I know it uses up two pins but is a good soulition as the comparator is
  7. Just a note of thanks for everybodys input on this project.... Built and bastardized... Alternative application time.... Wireless sim connection for JR / Spektrum. There is a minor change... C1 needs to be 47n not 22n... (the leading pulse is too short to register reliably with the Phoenix dongle) and the micro isnt required just link pin 1 and 5 Has been tested with an AR6100e and a DX6i so far but i'm sure DSX9's and so on will work OK.... Thanks Steve
  8. Try this one http://www.designsoft.com.au/ahome/rc/PIC-LMA/lma.html Steve
  9. Guys: I use a comparator and voltage ref module on a 627 or 675 and this cleans up the incoming signal (and leaves it inverted) then feed this out and then back in to the capture pin. This will give a 1Us accuracy when trigged from TMR0. Because its not reliant on latency within the interurpt then its repeatable. Just make sure that you manage the rollover of TMR (the reference for capture) properly or it will glitch... STeve
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