Audio

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Kravitz Lab edited this page Jan 26, 2026 · 1 revision

FED4 Audio Functionality

The FED4 uses an I2S-driven speaker (MAX98357A). Audio is initialized in begin().

Tones and beeps

playTone(frequency, duration_ms, amplitude) — single tone (e.g. playTone(500, 200, 0.25)).
lowBeep() — 500 Hz, 200 ms. highBeep() — 1000 Hz. higherBeep() — 2000 Hz.
click() — short click (quick feedback).
bopBeep() — two-tone beep (1000 Hz → 1600 Hz).

Jingles

playStartup() — startup melody. resetJingle() — power-cycle jingle. menuJingle() — menu arpeggio.

Other

soundSweep(startFreq, endFreq, duration_ms) — frequency sweep. noise(duration_ms, amplitude) — white noise.
silence() / unsilence() — mute audio (persists across reboots). enableAmp(bool) — amp on/off. resetSpeaker() — reinit I2S.

See FED4_Audio.cpp.