When you are working with electronics, especially power electronics you must have to measure line frequency. But most of the cases people do not have a frequency meter. If you knew how to make a frequency meter in a very easy way, you would make one for yourself. Here in this article, we’ll learn how to make a frequency meter with PIC16F73 general purpose micro-controller and LCD display. Using a multi-meter is ok to measure frequency but many people do not have a multimeter with frequency meter or sometimes, you need to attach a meter onboard not a multi-meter. Considering these issues, making a frequency meter yourself may become very helpful.

Here we used Timer0 as counter mode.

Timer0 settings:

Timer0 have an physical input clock pin (RA4/T0CKI). Using this input we can measure the pulse number for a certain time.