2 layers19 × 76 mm
Sub
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
15 parts3kApache-2.0
2 layers100 × 56.4 mm
MP3 Player
nathans-systems/Pineappley-PlayerMy Open-Source, Custom built MP3 Player.
- Size
- 100 × 56.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 39
- Pads
- 93
- Tracks, vias
- 229, 84
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 Aug 2026
- Updated
- 5 Sep 2026
Overview
MP3 Player is an open-source printed circuit board by nathans-systems, from the nathans-systems/Pineappley-Player repository on GitHub. It is a 2-layer board of 100 × 56.4 mm with 15 parts on 39 nets, routed with 229 tracks and 84 vias.
Its parts include 8 ICs, 2 capacitors, 2 resistors and 1 switch. It belongs with the ESP32 boards of this library.
README
README.mdPineappley-Player
My Open-Source, Custom built MP3 Player. Using an ESP32-S3-Zero, cheap, available parts and a custom PCB I designed I've built a reliable and high quality audio playing MP3 Player.
Hardware
- ESP32-S3-Zero
- 1.3 Inch I2C Oled
- Rotary Encoder
- TFT Micro SD Card Module
- KCX Bluetooth Emmiter
- TP4056 Charging Module
- MT3608 Boots Converter
- GY-PCM5102A
- 1800mah lithium battery
- Power Switch
Key Features
- High Quality Audio
- Headphone Out
- Bluetooth Connectivity
- Micro SD card reader
- Rechargeable Battery
Programming
The firmware is built on the PlatformIO and Arduino Framework. You can upload and edit the firmware using Arduino C++ and flashing the ESP via the USB-C port under the OLED.
PCB
I designed the PCB myself in KICAD. It features many through hole areas for each module, smd contacts for the KCX module and battery resistors and encoder capacitors.
How Does it Work?
After loading your MP3 Files onto the SD card, the files are read over SPI to the ESP. After decoding, the PCM signal is sent over I2S to the PCM5102. The PCM5102 converts the digital audio to analog which can be read by the KCX Emitter. The Pineappley Player utilises both cores of the ESP32-S3, forcing all audio tasks to core 0 to ensure clean audio as all other tasks such as drawing to the screen can run on core 1.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100nF | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 10K | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E_Vertical_H20mm | SW1 |
| 1 | ~ | MP3 player footprints:GY-PCM5102 | U6 |
| 1 | ~ | MP3 player footprints:KCX Bluetooth | U2 |
| 1 | ~ | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | U4 |
| 1 | ~ | MP3 player footprints:TFT MicroSD Module | U5 |
| 1 | ~ | MP3 player footprints:1.3 Oled | U3 |
| 1 | ~ | MP3 player footprints:ESP32S3 MINI | U1 |
| 1 | ~ | MP3 player footprints:TP4056-18650 | U8 |
| 1 | ~ | MP3 player footprints:hw-045 | U7 |
Questions
How big is the MP3 Player PCB?
It measures 100 × 56.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MP3 Player use?
15 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the MP3 Player KiCad files?
From the nathans-systems/Pineappley-Player repository on GitHub, at the commit this page was made from: the board is PCB/MP3 Player.kicad_pcb and its schematic PCB/MP3 Player.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MP3 Player design in my own project?
Its repository states no licence, so its author keeps all rights: ask nathans-systems before reusing the design.
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