Guitar (instrument) tuner using Galactic Unicorn

I’ve been fiddling around with the beta spectrum analyser code for the Unicorns on a Galactic Unicorn. I added a SparkFun Sound Detector soldered onto GPIO27 and read by DMA ADC a while ago. I’ve recently added some autocorrelation code and just got it working to a reasonable standard between about 30-500Hz.

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Hot off the press, Instructables: Making a Guitar Tuner and Audio Spectrum Analyser Using the Pimoroni Galactic Unicorn