3rd Brake LED Light (F1 style) - Electronic Circuits Projects Diagrams Free

kakata · 7th November 2009, 05:27 PM

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 · 7th November 2009, 06:31 PM

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

Jim

bountyhunter · 7th November 2009, 08:11 PM

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

kakata · 8th November 2009, 12:55 AM

Quote:

Originally Posted by bountyhunter

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

Not here where I live!

kakata · 8th November 2009, 12:56 AM

Quote:

Originally Posted by jimmythefool

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

Jim

Hey thanks!!....but, do you have any examples?

bountyhunter · 8th November 2009, 01:20 AM

Quote:

Originally Posted by kakata

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.

kakata · 8th November 2009, 02:14 PM

Quote:

Originally Posted by bountyhunter

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 · 8th November 2009, 03:20 PM

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

kakata · 8th November 2009, 03:59 PM

Quote:

Originally Posted by KMoffett

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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7th November 2009, 05:27 PM	#1
kakata	3rd Brake LED Light (F1 style) 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

7th November 2009, 06:31 PM	#2
jimmythefool	You could use a PIC microcontroller, with an output driver stage. The possible combinations, sequences etc are only limited by your imagination Jim

7th November 2009, 08:11 PM	#3
bountyhunter	FYI, this kind of light on a street vehicle will almost certainly be illegal in any state I know of.

8th November 2009, 03:20 PM	#8
KMoffett	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 Attached Thumbnails __________________ "To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931)