We’ve seen composite video out from AVR chips lots of times before. but we can’t remember coming across one that managed to produce a color signal. This project does just that, producing a color video signal from an ATmega168 without using external integrated circuits.
[CNLohr] is seen here showing off his accomplishment. You’ll remember him from the glass-slide PCB server project he’s been working on recently. this time around it’s a small piece of gaming hardware which he’s working on. but using four pins from the microcontroller, connected by means of resistors in parallel, he is able to generate a color NTSC signal without using a chip like the AD723.
After the break you can see the two minute demo in which he shows the game running for just an moment, then gives a general introduction of how the signals are being built. There isn’t a ton of explanation, but he did post his code as well as a resource for you to show yourself a lot more about the NTSC standard. maybe you can make a color version of that AVR tetris game?
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