I have a queston about using a 28 pin ATMega8 for a tachometer cicruit. From what I can draw the AVR will handle all of the process in code, so all I need(major components) on the board is the LED display connected to the AVR? Or should I use a multiplexing/IC, I am using 6 sevenseg displays(six digits). What pin on the AVR would I have the pulses from the pick up go to? My pick up is a LED/phototransistor unit I built. Also do I need some sort of signal filter to boost the pulses before they go into the mega8? Thanks for all your help.