2.4GHz Spectrum Analyzer using Nokia 3410 Phone

The project aims to construct a 2.4GHz spectrum analyzer that can view signals and other dominating channels used by surrounding transmitters such as Zigbee, WiFi, or Bluetooth.

Compared to other 2.4GHz spectrum analyzer built around the CYWM6935 module, this project features some improvements including portability, graphical LCD, and being microcontroller based. The chosen microcontroller is the ATmega8 that runs at 3.3V since both the CYWM6935 and the LCD module are 3.3V devices. Using the internal oscillator, the microcontroller was chosen to run at 4MHz since the ATmega8 can perform even when running with low internal clock rates. The LCD was obtained from a Nokia 3410 which uses a PCD8544 controller to make it easier to be operated.

The device can be powered from two kinds of batteries including Li-Ion and Ni-Mh with 3.6V-4.2V voltage range. A single 1N4004 diode was placed between the battery and the circuit in order to limit the voltage down to 3.6V due to the 0.6 voltage drop. This is suitable for the LCD and CYWM6935 which operates from 2.7V to 3.6V.

The AVR-GCC running under Windows (WinAVR) is being used to write the software in C.

Rest of the project