Frequency counter 400Hz to 50MHz with PIC 16F84

It consists only from Microchip PIC 16F84 cpu and LCD text module. Author states that this counter is capable metering frequencies from 400Hz to 50MHz. I used faster, 20MHz version of 16F84A-20I/P, and it managed to count 80MHz oscillator output.

Frequency counter 400Hz to 50MHz with PIC 16F84 - img1

It is made on testing breadboard and uncalibrated. I made it just for testing. And the schematics is almost unmodified. I used small TTL oscilators for testing. These devices are much more precise that cheap quartz crystal used in schematics. It is possible to adjust 10MHz and so you can calibrate your counter. Here is my testing readings- the device is uncalibrated. Quartz Freq readings 12.000000 MHz 12000112 Hz 25.175000 MHz 25175456 Hz 28.322000 MHz 28322656 Hz 80.000 MHz 79999616 Hz

Leave Comment

characters left:

New Circuits