hi all im new here i am studying electronics in A-level and i am wondering how i could make a rev counter display so basically it needs to be about 20 LED's in series, the input will go from 12v to 0v 4 times for one revolution, i am thinking of doing it by PIC chip but if there are any other suggestions then plz help out, also i want to make the LED's come on one at a time and the last one to stay on after the next comes on every 500 revs so 500, 1000,1500... and so on so if i make it up to 8500 revs ill use 17 LED's.
Last edited: