Firstly, the ebay claim that it would be shipped from somewhere in the UK turned out to be false, and it took a day or two longer than the maximum estimated delivery time to arrive from the Far East – ...

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.

This project aims to create a device which can measure and display the operating RPM and AFR of a small combustion engine. A Hall effect sensor is used to sense the magnet in the engine's flywheel ...