4 layers46.2 × 89 mm Projekt 1, the printed circuit board in 3D

Projekt 1

Lol im just bored and building a selfmade Mp3 player

Size: 46.2 × 89 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 67
Nets: 250
Pads: 475
Tracks, vias: 748, 148
Pours: 1
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 18 Aug 2026
Updated: 7 Nov 2026

Overview

Projekt 1 is an open-source printed circuit board by Pertifiatus, from the Pertifiatus/MP3-Player repository on GitHub. It is a 4-layer board of 46.2 × 89 mm with 67 parts on 250 nets, routed with 748 tracks and 148 vias.

Its parts include 25 capacitors, 16 resistors, 7 diodes, 6 ICs and 2 connectors. It belongs with the Raspberry Pi (Linux) boards of this library.

README

README.md

MP3-Player

A compact DIY music player, smaller than an iPod Touch, built around a Raspberry Pi Compute Module 4 on a custom PCB. It syncs your YouTube Music library straight to the device, no home server needed.

Concept

Front: round GC9A01 display for menus and navigation
Back: monochrome SSD1306 OLED for music visualizations
Audio: mainly Bluetooth A2DP, plus a 3.5 mm headphone jack (ES8388 codec)
Controls: button box (SX1509 GPIO expander) + IMU (QMI8658A) for orientation and shake gestures
Power: Li-ion battery, USB-C charging (RT9466) with an 80% charge limit, fuel gauge (MAX17048), soft power button
Lighting: SK6812 status ring

Hardware

Part	Details
Compute	Raspberry Pi CM4 Lite Wireless (boots from microSD), on 2× Hirose mezzanine connectors
Power	TPS63020 buck-boost, RT9466 charger, MAX17048 fuel gauge
Audio	ES8388 codec over I2S
Displays	GC9A01 (SPI0), SSD1306 (SPI4)
PCBs	Main board + ButtonBox, designed in KiCad (`KiCad/Projekt 1`)
Case	Fusion 360 (`CAD/Player.f3z`)

Software (`Software/`)

Python on Raspberry Pi OS, running as systemd services:

File	Purpose
`main.py`	Main UI loop (front display, buttons, IMU)
`player.py`	Playback
`sync_youtube.py`	YouTube Music library sync
`connectivity.py`	WiFi / Bluetooth connections
`ui_state.py`, `ui_render.py`	UI state machine and rendering
`ui_views.py`, `ui_common.py`	Screen content as plain data, shared drawing helpers
`themes/`	8 switchable designs (Einstellungen → Anzeige → Design): Klassik, Cybercore, Y2K, Glas, Neumorph, Bento, Pixelhaus, Cyberpunk
`preview_themes.py`	Preview sheet per design (`previews/`), `--bench` render timings
`fonts/`, `assets/`	Bundled OFL fonts, Pixelhaus house image
`buttonbox.py`, `qmi8658.py`, `es8388.py`, `max17048.py`, `rt9466.py`	Hardware drivers
`charge_control.py`, `power_button.py`	Charging logic and soft shutdown
`led_control.py`, `led_service.py`	Status ring LEDs
`setup_pi.sh`, `.service`, `sdcard-boot-`	Pi setup and boot configuration
`test_*.py`	Tests

Status

Work in progress. Board 2 boots reliably; the software bring-up and debugging of battery operation are ongoing. Detailed notes on hardware, pinout, config.txt and lessons learned are in CLAUDE.md and Software/NOTES_FOR_PER.md.

Repository structure

text

CAD/        Fusion 360 case
KiCad/      Main board + ButtonBox (schematics, PCB, 3D models)
Software/   Python application, drivers, services, tests
docs/       Design specs and plans (status ring, quick connect, design themes)

Category and platform

Raspberry Pi (Linux)

Project files

Show this board on your page

https://pcbkit.io/boards/Pertifiatus/MP3-Player

The board's own page, for a message or a post.

Source

Repository: Pertifiatus/MP3-Player
Board file: KiCad/Projekt 1/Projekt 1.kicad_pcb
Commit: f6baa87
Licence: Not stated

Parts

Qty	Value	Footprint	References
9	100nF	EasyEDA_Lib:C0402	C2, C3, C7, C9, C11, C14, C16, C19, C23
6	~	EasyEDA_Lib:LED-SMD_4P-L3.2-W2.8-LS5.9_SK6812MINI-E	LED1, LED2, LED3, LED4, LED5, LED6
3	10uF	EasyEDA_Lib:C0402	C13, C17, C25
3	2.2uF	EasyEDA_Lib:C0402	C1, C18, C20
3	22uF	EasyEDA_Lib:C0402	C4, C5, C6
3	4.7uF	EasyEDA_Lib:C0402	C21, C24, C26
3	5.1kΩ	EasyEDA_Lib:R0603	R1, R10, R11
3	~	EasyEDA_Lib:CONN-TH_B8B-PH-K-S-LF-SN	4PinfuerBoard1, RundesDisplay1, Visualizer1
2	0Ω	EasyEDA_Lib:R0603	R6, R7
2	100kΩ	EasyEDA_Lib:R0603	R13, R14
2	100uF	EasyEDA_Lib:C0805	C8, C10
2	33Ω	EasyEDA_Lib:R0603	R2, R5
2	50kΩ	EasyEDA_Lib:R0603	R15, R16
1	1.5uH	EasyEDA_Lib:IND-SMD_L4.0-W4.0-A	L1
1	1.6MΩ	EasyEDA_Lib:R0603	R4
1	10Ω	EasyEDA_Lib:R0603	R8
1	178Ω	EasyEDA_Lib:R0603	R9
1	180kΩ	EasyEDA_Lib:R0603	R3
1	1uF	EasyEDA_Lib:C0603	C12
1	1uH	EasyEDA_Lib:L2520	L2
1	220Ω	EasyEDA_Lib:R0603	R12
1	47nF	EasyEDA_Lib:C0402	C15
1	Boot Button	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J1
1	ComputeModule4-CM4	Pertificatus:CONN-SMD_DF40HC-3.0-100DS-0.4V-51	Module1
1	Switch	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J2
1	~	EasyEDA_Lib:LGA-14_L3.0-W2.5-P0.50-TL	U5
1	~	EasyEDA_Lib:AUDIO-SMD_PJ-327C-4A	AUDIO1
1	~	EasyEDA_Lib:QFN-28_L4.0-W4.0-P0.45-BL-EP	U2
1	~	EasyEDA_Lib:TF-SMD_TF-PUSH	CARD1
1	~	EasyEDA_Lib:SOT-23_L2.9-W1.3-P1.90-LS2.4-BR	Q1
1	~	EasyEDA_Lib:WQFN-24_L4.0-W4.0-P0.50-TL-EP2.5	U4
1	~	EasyEDA_Lib:SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR	U6
1	~	EasyEDA_Lib:VSON-14_L4.0-W3.0-P0.50-BL-EP_TI_DSJ	U3
1	~	EasyEDA_Lib:TDFN-8_L2.0-W2.0-P0.50-BL-EP1.2	U1
1	~	EasyEDA_Lib:USB-C_SMD-TYPE-C-31-M-12_1	USBC1
1	~	EasyEDA_Lib:SOD-123F_L2.7-W1.6-LS3.8-RD	D1
1	~	EasyEDA_Lib:CONN-TH_B2B-PH-K-S	Battery1

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Questions

How big is the Projekt 1 PCB?

It measures 46.2 × 89 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Projekt 1 use?

67 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 Projekt 1 KiCad files?

From the Pertifiatus/MP3-Player repository on GitHub, at the commit this page was made from: the board is KiCad/Projekt 1/Projekt 1.kicad_pcb and its schematic KiCad/Projekt 1/ButtonBox/ButtonBox.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Projekt 1 design in my own project?

Its repository states no licence, so its author keeps all rights: ask Pertifiatus before reusing the design.