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same as tachometer project this one uses a 100khz tmr interrupt to measure and display rpm, generally when i do fast timer projects i use seperate chips to do this task like small 12f1840 chips and create a multiplexed 9 bit uart send receive lines so chips can exchange information when requested

Thanks for sharing. I did exactly similar thing in my FCU (free cooling unit) design where EC fan was monitored and controlled by separate chip.