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Thread: [queued] guitar tuner with FFT and Yin

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    [queued] guitar tuner with FFT and Yin

    Here a tuner and frequency logger project I just completed.

    The tuner uses yin algorithm from the teensy audio library, fft frequency estimation from here (had to edit cpu defines for T4), a bubble-display library from here, serial command library from here and my own led and button libraries. Also I put together some code for reading a wacky mechanical rotary encoder, similar to this code, with polling, so no interrupts (see attached files), it debounces fine.

    The tuner can act as a device for musicians (it also has a metronome) and measures battery voltage: as soon as voltage drops it writes it's settings to eeprom. Various settings can be tuned via the serial interface and saved into eeprom. See screen shots for details and serial output of yin and fft.

    Click image for larger version. 

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    left: first version with T3.6, middle T3.6 without display (will be used as a frequency logger for a project musicians and physicians are working on), right T4 with speaker, rotary encoder and lipo-charger.

    Click image for larger version. 

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    voltage = 4.1V

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    T4 with transparent plastic cover

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    PCB designed in kicad

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    serial output of yin and fft

    Click image for larger version. 

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    tuning the settings via serial

    code files: tuner.zip
    Last edited by jpk; 05-08-2020 at 03:51 PM.

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