Hi folks

Im doing a project at uni which involves me designing and constructing an led flashing signal board that is used in Motorsport, also i might point out im a mechanical student with only a basic understanding of the voodoo that is electronics. After having a mooch around the net it seems that my only viable option is to use a 555 timer.

My main question is what sort of capacitor and resistor values am i looking to be used if this idea is actually viable. (see below for actual specs). Also if anyone knows of any 555 'bible' websites id be grateful.

System Requirements:
12v dc 7.0ah
150 leds (ten clusters of 75 5mm leds (15 leds of each colour/only one colour on at a time)
Colours - red,yellow.blue.green.white (also aware of different led specs)

I'm aware that a single 555 timer cant handle the 150 which is why I have split the leds into clusters, also assuming one 555 per colour group per cluster if that makes sense.

Any help from you electrical geniuses much appreciated

Ta

Luke

 

There are many good sites on 555.
Here are two of them:

http://www.allaboutcircuits.com/vol_6/chpt_8/1.html

http://www.sentex.ca/~mec1995/gadgets/555/555.html