Contact less Tachometer Using Hall Effect Sensor

Description

This kit describes how to build a contact-less tachometer (a device used to count the revolutions per minute of a rotating shaft) using an AVR Family microcontroller and a hall effect sensor. As the name implies, what makes this device special, is that it can very accurately measure the rotational speed of a shaft without even touching it.

This Contactless Tachometer Using Hall Effect Sensor is very interesting when making direct contact with the rotating shaft is not an option or will reduce the velocity of the shaft, giving faulty readings. This device is built on an ATMEGA 168 microcontroller, an alphanumeric LCD module, and a Hall Effect sensor to detect the rotation of the shaft whose speed is being measured.

The Contactless Tachometer Using Hall Effect Sensor kit idea behind most digital counting devices and tachometers is a microcontroller, used to count the pulses coming from a sensor or any other electronic device. In the case of this tachometer, the counted pluses will come from the Hall Effect sensor, which will detect any magnetic element passing in front of it, and thus, will give an output pulse for each and every rotation of the shaft, as shown in the picture. Those pulses will be fed to the microcontroller and counted.