A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.
E-books
Disclaimer
Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.
AVR frequency counter
29. April 2008 - 9:09 — admin
A simple, inexpensive and versatile frequency counter with LCD display and some special extra features.
How would you like a 40 MHz frequency counter for under $50? What if I told you it also had an 8 digit LCD display, optional offsets for use in a receiver or transceiver, 10 Hz (even 1 Hz!) resolution, and also a six channel digital voltmeter built in? Direct reading with prescalers in the VHF version? Oh, and optional PC telemetry so you can watch the output on a PC, log the results, or graph drift? Well, read on!
Some of the features of the unit are:
- Four ranges, with 10 Hz and 1Hz resolution to at least 40 MHz.
- High sample rate (5 samples/sec or more) with averaging to remove jitter.
- Programmable ± offsets and S-Meter display for receiver or transceiver.
- Binary and BCD maths to provide direct reading of frequency with prescalers.
- Low current single supply operation. Can be operated from a small battery for portable use.
- Optional high speed PC telemetry.
- Well documented source code is available, so the design can easily be adapted.
Features of the PC telemetry application provided are:
- Six A-D channels and high resolution counter channel.
- Graphical colour display on the PC, with digital display, bar-graphs and a trend graph.
- PC display completely configurable independently on each channel.
- Channel data type, gain, offset, and measurement units can all be preset.
(A construction By Murray Greenman ZL1BPU)