When you’re driving your car, you’re probably regularly looking at the speedometer to make sure you comply with the local speed limits. The method by which it works is simple enough: ...

Abstract: The goal of this research is to increase road safety by measuring wheel RPM and identifying instances of over speeding using an inductive proximity sensor. An SMS warning is sent to a ...

A tachometer measures the rotation speed of motors and other machinery. There are various types of tachometers. Described here is a digital non-contact type tachometer using a proximity sensor. The ...