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100MHZ Frequency Counter with PIC16F628A

100MHZ Frequency Counter with PIC16F628A

This project shows how to build a very simple yet very useful tool that every DIY enthusiast should have in his lab: a 100MHz+ frequency counter.

The schematic is fairly simple and straightforward and uses a PIC16F628A microcontroller for measuring frequency and a high speed comparator for signal amplification and conditioning.



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The microcontroller uses its internal 4MHz oscillator for the CPU clock. Timer1 uses an external crystal resonator (watch crystal) with 32768Hz frequency for setting the 1 second time base.

Timer0 is used to count the input signal at pin RA4.

100MHZ Frequency Counter with PIC16F628A – [Link]

 




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