In elektronika.lt and in original pages at sprut.de there is placed simple frequency counter schematics. 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.
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 |
THANK YOU FOR YOUR PROJECT (16F84 FREQUENCY COUNTER) AND I NEED THE HEX FILE FOR THAT SEND TO ME. AND THANK FOR YOU>>>
Read comments in http://www.vabolis.lt/2006/02/09/talpos-matuoklis-su-pic/
http://blog.savel.org/2006/02/06/16f84-frequency-counter/
Hex Kodu + Şema Olarak Rica Ede bilir miyim.
From Editor: Galvoji aš čia labai supratau ką čia prikomentavai?
I would like to set the frequency counter and I need the hex or asm, what is its cost.
I’m from Argentina
Read Lithuanian version
, at the end of article there are links.
http://www.vabolis.lt/2006/02/06/daznimatis/