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3rd Brake LED Light (F1 style)

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kakata

New Member
Hi

I need help for building a small circuit to drive a 18 LED strip to be used as a 3rd Brake Light in my car (12V), that emulates the ones from F1 cars used in raining race.

LEDs should light in the following way:

50ms Burst Flash (1 sec aprox.)
250ms Flash (.5 sec aprox.)
On (steady until off)

I think I can use a 555 but the burst rate will be a problem...any ideas?


Thanks!

PS: Data from the LED strip is here:
SMD 3528 Flexible LED Light Strip 300 LEDs
 

jimmythefool

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


Jim
 

bountyhunter

Well-Known Member
Not here where I live!

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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kakata

New Member
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.

Ok!, will try that...I will search for ways to get the sequential flash rates and keep you posted....

Thanks!!!
 

KMoffett

Well-Known Member
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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kakata

New Member
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

Hey thanks!, this is a way good start....
 
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