3rd Brake LED Light (F1 style)

bountyhunter said:

FYI, this kind of light on a street vehicle will almost certainly be illegal in any state I know of.

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jimmythefool said:

You could use a PIC microcontroller, with an output driver stage. The possible combinations, sequences etc are only limited by your imagination


Jim

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kakata said:

Not here where I live!

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bountyhunter said:

Well, then there is a very easy method to get a flashing red light followed by a solid red:

You use two 555 timers which are OR connected to the gate of the FET that drives the brake light or LED. In other words, either 555 can turn it on. Set up one 555 as a free running astabe at some pulse frequency and set the other up as a one shot with an inverter so it drives the LED on solid after the time duration elapses.

When you apply power, the astable will pulse the LED. After the other 555 times out, it turns it on steady.


I built this for my motorcycle a while back (which is how I found out they are illegal here). I don't know any easy way to get two different flash rates in a row followed by a solid red.

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KMoffett said:

Another option for pulse-than-steady, like bountyhunter's, is one I made many years ago.

Just in my head...two oscillators + two delay circuits + AND or OR gates. The first two parts are easy, but the logic in the third part will take some thinking.

Actually, now I'd opt for a cheap and easy 8-pin µController like a PICAXE.

ken

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