Do you need an avr counter that can measure for 40Mhz and low cost for this project? Well take a look at microcontroller project : avr counter created by Murray GreenMan. This microcontroller project also give you some interesting feature like : 8 digit LCD display and there is an optioanal PC telemetry so you can watch the output on a PC.
"The counter contains only three inexpensive ICs (well, add a regulator and three transistors), and operates from 6 - 15V DC at about 25mA. The most expensive single item is the LCD display, which is an industry standard 16 x 2 dot matrix module, which can often be found used or at bargain prices. This isn't a kitset, but the parts are easily obtained, and the circuit can be built using any prototyping technique, or you could design your own PCB. The prototype was built on a small commercial strip board."
Another feature of AVR counter 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.
- 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.
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