ArduinoTachometer

Simple Arduino tachometer using Hall effect sensor.

This is a basic Tachometer, it uses a Hall effect sensor to detect a magnet on the shaft of the device you are measuring the speed of. Output is to a LCD screen in RPM. The screen brightness can be adjusted with the potentiometer.

Parts

• Arduino Pro Mini (5V)
• 16x2 LCD display (Hitachi HD44780 type)
• 10k Potentiometer
• Hall effect sensor
• on/off switch
• 9V battery clip
• Battery/wires etc

Wiring

Wiring for the LCD display is per the Arduino tutorial as referenced in the code. Some of the pins have been changed as they used pin 2 originally which we require for the Hall effect sensor change interrupt.

Installation

Code is compiled and installed the normall way with the Arduino dev environment.

Use

Attach a (small) magnet to the shaft of the device you want to measure. Arrange for the Hall effect sensor to be close to the magnet as it goes past.