The FFT Extension board provides a comprehensive platform for evaluating the FFT Module. It provides access to serial interface, power, and analog input pins, while a built-in analog microphone enables immediate audio FFT analysis. Additionally, users can easily connect the module to the provided PC application via USB.

The extension board is a great way to evaluate the FFT Module. It enables PC Application communication over USB. It provides power to the FFT module. It maps all the pins out to the user. It supports both single-ended and differential analog inputs. The extension board design can be used as a hardware design reference.