I know the tachometer thing has been beaten to death ( I searched all the listings for it already), but noone really asked what I need to know. I have a PIc 18f4550 that I will be using as an led shift light. 7 leds are connected along port b and are set to light up at certain intervals. The only thing I dont know how to do is condition the tach signal for use by the pic. My tach signal wire is connected to the ignition coil and outputs 12 Volt pulses. Could anyone give me some examples of how to clean up this signal, and drop it to a stable 5 volt pulse?
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