BoardPilotPAM8403 stereo amplifier 2x3 W with ESP32
Supply 5 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| 5V | Power | VIN | Pin order varies between boards: match by the printed label. 2.5 to 5.5 V. Use VIN (5 V) for full volume |
| GND | Ground | GND | Also the audio input ground |
| L | Input (the ESP32 drives it) | D25 | Left audio in. ESP32 DAC GPIO 25 or 26 works; the module has input capacitors |
| R | Input (the ESP32 drives it) | D26 | Right audio in |
| L+ | Not wired to the ESP32 | — | Left speaker + |
| L- | Not wired to the ESP32 | — | Left speaker -. Bridged output: never connect to GND |
| R+ | Not wired to the ESP32 | — | Right speaker + |
| R- | Not wired to the ESP32 | — | Right speaker -. Bridged output: never connect to GND |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.
Sources
- Diodes Inc. PAM8403 datasheet, Supply 2.5 to 5.5 V; bridge-tied (BTL) outputs, 3 W into 4 Ω
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.