ABSTRACT

ABSTRACT Aim of the design is to develop a system based on Embedded micro controller(8051) which is used as a digital contact less tachometer for measuring the speed(in rpm) of the AC(or) DC motor by using Infrared Frequency without the help of a expensive tachometer available in the market. The current design is an embedded application which is used to calculate the speed of the motor without the need of tachometer. In this application IR frequencies are used to calculate the speed of the motor. Place the tx and rx in such a way that the IR transmitter continuously generates the infrared rays and the receiver receives it. To the motor shaft arrange one circular arrangement having a small hole and position it exactly at the middle of tx and rx arrangement in such a way that when the shaft rotates, only at one point the IR rays falls on the rx. Now make the motor to run at some speed. As usual the IR receiver receives the IR signals from the transmitter when the motor was running for every one complete rotation. The IR receiver (TSOP) sends these data to the micro controller; the controller compares the data and calculates the speed of motor. Speed (in rpm) was displayed on the display unit (LCD). This method of calculating speed is very inexpensive and cheap when compared to the tachometers available in the market.