Sample code to make fft on adc input on pico. This uses the KISS FFT (https://github.com/mborgerding/kissfft)
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Fast Fourier Transform for Arduino
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TRX with gps for telemetry
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Minimal WSPR beacon using Si5351Arduino library
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WSPR-TX Pico Transmitter
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Arduino firmware for WSPR-RX Hardware Version 2.
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