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The Frequency Counter (FC) of the MP20 is based on a PIC chip and LCD display available in kit form from AADE for about $50. It uses the PIC to count the frequency, format the information, and display the frequency on the backlit (in the case of the MP20) LCD display. The FC unit was the first section of the MP20 to be assembled by the builders. The official lessons called for a much larger board (~ 3"x4") than I used (1.4"x3.2"), because my board fits on the back of the LCD display, and connects with a cut-up IC socket (on my board) and a header (on the LCD board). This allows me to detach the LCD from the PIC circuitry so that I can use the LCD in my own experimental projects. I started fabrication of the PC board on Friday night (3/2/2001), and finished the circuit construction the following morning. The building was pretty tight near the PIC, but on the other end of the board it was much more open. I got it assembled, and it didn't work, naturally. So I set out to find the problem. By the end of the day, the PIC wasn't even talking to the LCD, so I planned to buy another one from a parts vendor and program it. However, I did one last check a few days later (3/7/2001), and found that the RS and Enb pins on the LCD were switched! I quickly corrected the problem, hooked it up, AND IT WORKED! I was thrilled, I finally solved the problem! Later that night I finished the FC with the installation of the backlight resistor. Check out the pictures below in more detail by clicking them...
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[Mobile Computing] [What's QRP?] [Online Log (old)] [About Me] [MX Riding]
[My "Ham History"] [QRP Wattmeter] [SW40+]
This page last updated 12/22/01.
© 2001 N8MX.