Guitar Tuner

Pick a string; the tuner shows the detected note, the cents you're off, and a moving needle that turns green when you land on pitch. FFT pitch detection runs on the codec input at 16 kHz.

Controls

• BOOT — cycle string presets (E A D G B e or chromatic)
• PWR — toggle mic gain

setup.txt keys (all optional)

• TUNER_MODE — AUTO or MANUAL (default AUTO)
• TUNER_MIC_GAIN — 0–7 (default 5)
• TUNER_CENTS_TOL — in-tune tolerance in cents (default 3)

Editing setup.txt

The device reads /setup/setup.txt from the SD card on boot. Download a working sample — covers every app — and edit the keys you need.

Don't want to eject the card? Use the USB Stick app (mounts the SD card as a USB drive over USB-C) or the Filehub app (edit over WiFi).