Decoding a MP3 file
In this example we decode a MP3 file into RAW output and write the output with the help of a PWM signal to the pins.
Currently we provide multiple mp3 decoders
- libhelix
- tinymp3
Unfortunatly non of those are currently stable in all environments....
Output Device: Earphone
To test the output I am using an earphone from a mobile phone. We get 2 signals one for the left and the other for the right channel.
The pins depend on the Processor:
| EarPhone | ESP32 | RPI Pico | MBED |
|---|---|---|---|
| Left | GPI2 | GPI2 | GPI2 |
| Right | GPI3 | GPIO3 | GPI3 |
| GND | GND | GND | GND |
To verify check the PIN_PWM_START in AudioConfig.h or you can set the pins by calling setPins() method on the PWMConfig object.