Adil Malik made a low cost FFT LCR meter with an STM32 MCU: The approach I took was a mixed signal one where a capable analog front end would be paired up with a beefy DSP processor to compute the Impedance. Most importantly, in this scheme, the DSP is responsible for discriminating the phase between […]
Squank provided some links for developers who’d like to use the Fast Fourier Transform in low-power MCUs. FFT is an algorithm used in DSPs to quickly convert time-based functions to spectrum-based function, and vice versa. Via the forum.
Here’s an application using FFT on an PIC18F4550 8-bit microcontroller: This project implements a real-time audio spectrum analyser using a PIC18F4550 8-bit microcontroller. The spectrum frequency analysis is performed by a highly optimised 16-bit Fast Fourier Transformation (FFT) routine coded entirely in C. The output from the FFT is displayed using a 128×64 graphical LCD […]