This 2.4GHz Spectrum Analyzer project build based on Cypress CYWUSB6935 module. The project allows you to monitor the 2.4GHZ ISM band in your immediate vicinity. You can monitor what’s going on and figure out what channel to change your Wi-Fi network to in order for it to keep working when your neighbor rudely sets up their wireless network on the same channel as you.
The device connected to LPT port of a PC that runs plotting software that is built in Qt. The qtscan application will display the current scan as a red line. Absolute peak levels are displayed as green bars behind the red line. The ticks on the x-axis are each channel at 1MHz intervals. The span is from 2.4GHz to 2.483GHz. The yellow lines are the 13 802.11b channels. The y-axis ticks represent the 32 levels from the RSSI register. This is very useful tool to test your WiFi channel.
Project Documentation and Schematic