A tachometer used to be an accessory added to the dash of only the sportiest of cars, but now they’re pretty much standard equipment on everything from sleek coupes to the family truckster. I… ...

Posted in Tool Hacks Tagged arduino, emitter detector pair, infrared, measurement, op-amp, rpm, square wave, tachometer, tool ← Robotic Laser Keeps Cat Entertained While You Hack ...