This tutorial will guide you through the process of building a tachometer around an Arduino ... calculate RPM. Another alternative would have been to use a reflectance sensor which allows to ...

If your daily driver was born without a tach, fear not – a simple Arduino tachometer is well within ... The first LED lights at 4000 RPM, with subsequent LEDs coming on at each 500 RPM increase ...

Hello everyone! Today I’m going to discuss a cheap type of useful digital rotation per minute counter (Digital RPM Counter). The 4-Digit LED Display RPM comes with a magnetic proximity sensor switch.