Circuit Lake

Electronic Project and Circuit Collection

AVR Frequency Counter

04/20/2008 Category: AVR, Microcontroller

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.

AVR Frequency Counter

“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.

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.