cimo Posted April 26, 2010 Report Share Posted April 26, 2010 Hi I am looking for more advice for a simple project: the circuit should light up 4 ultra-bright LEDs randomly, that s it, maybe being able to change the way it behaves would be nice as well.. tx Quote Link to comment Share on other sites More sharing options...
TK. Posted April 26, 2010 Report Share Posted April 26, 2010 http://www.free-electronic-circuits.com/circuits/8-random-flashing-leds.html Quote Link to comment Share on other sites More sharing options...
cimo Posted April 26, 2010 Author Report Share Posted April 26, 2010 http://www.free-electronic-circuits.com/circuits/8-random-flashing-leds.html Hi I know that circuit, I ve actually won 2 years ago' pumpkin contest in Sahira school with a flashing blue and red pumpkin... scaaaryy The point is that now I need to flash a single light (4 leds in parallel) at random intervals .. tx Quote Link to comment Share on other sites More sharing options...
TK. Posted April 26, 2010 Report Share Posted April 26, 2010 Ah alright, so you need more randomness for a single light. I would take a microcontroller (can be a real small one) that outputs a pseudo random pulse train, e.g. with a linear feedback shift register algorithm (LFSR) Building a LFSR with discrete logic is too complex/expensive. Using a discrete true random generator (example) is a bit easier to build, but it wouldn't give you enough control about the effect (and this was your request) Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
SLP Posted April 27, 2010 Report Share Posted April 27, 2010 two NE555 (556) and a "AND" gate or something? Quote Link to comment Share on other sites More sharing options...
clem! Posted April 27, 2010 Report Share Posted April 27, 2010 Hi, perhaps this can help to do it software based: http://courses.missouristate.edu/KenVollmar/MARS/CCSC-CP%20material/Fibonacci.asm Best regards, clem! Randomness is an Illusion Quote Link to comment Share on other sites More sharing options...
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