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https://github.com/madskjeldgaard/pico-audio-player-firmware

Firmware for a low cost .WAV-file player
https://github.com/madskjeldgaard/pico-audio-player-firmware

arduino audio platformio raspberry-pi-pico

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Firmware for a low cost .WAV-file player

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# Pico Audio Player



![image of breadboard](assets/breadboard.jpg) 



This is a simple audio file player based on the Raspberry Pi Pico boards that plays high quality audio files from an SD card. 



[There's a video here, showcasing the project](https://www.youtube.com/shorts/I8tGyGWEGCI).



## Features



- Plays uncompressed audio files (44.1khz 16 bit WAV files, but more coming) from an SD card

- Can be used with cheap high quality DAC

- Based on [Arduino Audio Tools](https://github.com/pschatzmann/arduino-audio-tools) and Platformio, so you can easily fork this project and use it for another audio project. 

- The onboard BOOTSEL button works as a NEXT-button to go to the next audio file in the player.



*Note:* To make this run smoothly, the Pico 1 is overclocked to 270mhz. Do this at your own risk. 



## Electronics



To make this project, you need:



- An SD card reader module

- A DAC module

- A Raspberry Pi Pico board



These components cost less than 10€ in total usually.



### The DAC



I use a PCM5102A i2s DAC board from Ali Express / Ebay / wherever for this. 



Note, if you are using the same, please make sure the jumpers on the back are soldered like this, otherwise it will be muted by default:



![image of pcm5102A board](assets/pcm5102A.jpg) 



#### Pin connections



| PCM5102A Pin | Pico PIN     | Notes                   |

| ----------- | ------------ | ----------------------- |

| SCK         | GND          |                         |

| DIN         | GPIO28       |                         |

| LCK         | GPIO27       |                         |

| BCK         | GPIO26       |                         |

| GND         | GND          |                         |

| VIN         | 3V3          |                         |



### SD Card reader



I use this simple and cheap SD card reader from Ali Express / EBay / wherever:



![image of sd card reader board](assets/sdcardreader.jpg) 



#### Pin connections



Please make sure your sd card reader module's power requirements. Some only take 3.3v, others only 5v. Adjust accordingly:



| SD card pin | Pico pin                                                                        |

| ----------- | ------------------------------------------------------------------------------- |

| MISO        | GPIO16                                                                          |

| MOSI        | GPIO19                                                                          |

| CS          | GPIO17                                                                          |

| SCK         | GPIO18                                                                          |

| VCC         | VSYS (unless your SD card module is a 3V one, then connect it to 3V3(OUT)) |



### Notes about the SD card



The SD card should be formatted as FAT32. Don't use low quality / off brand SD cards. You'll be sorry if you do.



Audio files should be in the format 44.1khz sample rate / 16 bit.



## Compiling



This project is built with Platformio. With a Raspberry Pi Pico connected to your computer, you can compile and upload the firmware in one go from the command line by running this from the root of this project:



```bash

pio run -t upload

```