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