100MHz frequency counter with LCD display

Update November 26, 2015:
I made a full project with preamp/signal conditioning and power supply with soft on/of switch. It is published here.


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This is the same as the previous frequency counter but the output is on the 16x2 LCD display.
For more details about how it work look here: http://diyfan.blogspot.bg/2015/08/100mhz-frequency-counter.html

100MHz frequency counter

Couple of weeks ago I purchased from eBay one of these amazingly cheap an useful modules with MAX7219 LED driver and 8 digit LED display. It is ideal for frequency counter project. The problem was the absence of library for PIC microcontrolers. Luckily, I found a great library for Arduino and I reworked it to be compatible with PIC. The schematic of the frequency counter is actually almost the same as the previous . It uses PIC16F628A microcontroller with external 32.768kHz watch crystal attached to Timer1 to generate 1 second time base. Measured signal is fed to pin3 (RA4) which is counted by Timer0.

Frequency counter with PIC16F628A

Some time ago I made an audio oscillator with frequency counter which worked very well, but I sold it, and now I am making a new one. The oscillator itself will be mostly the same and when I finish the whole project there will be a separate article. Here I will show the frequency counter module I made for the project.

Simple timer with PIC16F628A

This is a quick project for a timer. Recently I finished my UV light exposure box and thought that it will be convenient to have a build in timer to switch off the light after preset time.
So I had a PIC16F628A lying around and after searching the web I found a Brazilian site (I think?) with tons of interesting projects with microcontrolers. This project is based on one of them.