Design of a Contactless tachometer

[摘要] Tachometer is used to measure speed of motor or shaft or propeller. This tachometer is designed using ATMega16 micro-controller. It can measure time interval with better accuracy. Attractive feature of this is it measures speed without any physical contact with shaft or motor. It shows RPS speed on LCD and Tachometer setting can be changed from simple push buttons. It uses low cost infrared transmitter-receiver pair for sensing propellers.

[关键词] Tachometer;ATMEGA16 microcontroller;infrared module;dc motor