Have you ever wondered exactly what is going on in the 2.4GHz WiFi and ISM band around your house. What channel is it best to set your wireless router to? Why are you getting such poor performance across your WiFi network? Is your neighbour on the same frequency?
Just what is out there? This neat little gadget will sniff the airwaves and give you a graph of the signal strength vs frequency across the entire band. It connects to your computer by USB 2.0 and with the companion Windows software you can display the spectrum or save the raw data to an Excel compatible file for some more number crunching.
It uses just two significant components, a radio module from Cypress Semiconductor and a PIC microcontroller. Total cost to build it should be less than US$30.
This project was inspired by an article by Jason Hecker in the June 2007 issue of Elektor. Thanks Jason.
2.4GHz WiFi & ISM Band Scanner - [Link]