Simple Speed Sensor using Arduino + Hall Effect Sensor

Using 2.5” HDD drive running at 5400rpm
Just a way to prove that it is really running at 5400rpm

Arduino Code:

Required Libraries:
Install through Library Manager
TM1637Display.h

[aripjamaludinrumi]

it's work for me, however The rpm value goes up and down even though I use a push button instead of a potentiometer to turn the motor.