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  1. volatile byte revolutions; unsigned int rpmilli; float speed; long gTest; unsigned long timeold; void setup() { Serial.begin(9600); pinMode(PUSH2, INPUT_PULLUP); attachInterrupt(PUSH2, rpm_fun, FALLING); revolutions = 0; rpmilli = 0; timeold = 0; } void loop() { if (revolutions >= 5) { //Update RPM every 20 counts, increase this for better RPM resolution, //decrease for faster update // calculate the revolutions per milli(second) rpmilli = (revolutions/(millis()-timeold)); //** EDIT: it should be revolutions/(millis()-timeold) unsigned long test = mi
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