2 layers116.8 × 30 mm
Type d
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
14 parts3kApache-2.0
2 layers85.1 × 45.1 mm
First custom PCB
Apfelmark33/First-Custom-PCB-ControllerA simple custom pbc controller board to learn how to design one.
- Size
- 85.1 × 45.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 29
- Pads
- 93
- Tracks, vias
- 99, 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 23 Jun 2026
- Updated
- 25 Jun 2026
Overview
First custom PCB is an open-source printed circuit board by Apfelmark33, from the Apfelmark33/First-Custom-PCB-Controller repository on GitHub. It is a 2-layer board of 85.1 × 45.1 mm with 14 parts on 29 nets, routed with 99 tracks and 5 vias.
Its parts include 5 resistors, 4 diodes, 3 switches and 1 IC. It belongs with the RP2350 boards of this library.
README
README.mdPathfinder
A custom, password-protected PCB controller board that acts as a digital combination lock system. It's essentially a safe but without anything in it (yet).
I used KICad to make the pbc and the arduino IDE for the code.
Project Overview
How it Works Pathfinder is a simple electronic lock system that uses 3 buttons to enter a password. As you press the buttons, LEDs light up to show your progress, and a small speaker (piezo buzzer) plays different sounds to let you know if your password was right or wrong.
Key Features Smart Code Checking: Instead of just adding numbers together (where the order doesn't matter), the board remembers the exact sequence of your button presses. If your password is "abc", typing "cba" won't open it!
Every time you press a button, an LED turns on. By the third press, all three LEDs light up so you know you've entered the full 3-character code (a 3 character code is necessary but it can always be changed in the firmware)
Sound Alerts: The system talks to you through sound (so you know it works). It plays a happy, double-beep if you get the password right, and a low, buzzing tone if you get it wrong (room for improvement).
Schematic
PCB Layout
3D Model
Bill of Materials (BOM)
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3, R4, R5 |
| 3 | L08R5000Q1 | footprints:LEDRD254W57D500H1070 | D1, D2, D3 |
| 3 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | LED | LED_THT:LED_D5.0mm | D4 |
| 1 | XIAO-RP2350-DIP | footprints:XIAO-RP2350-DIP | U1 |
Questions
How big is the First custom PCB PCB?
It measures 85.1 × 45.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the First custom PCB use?
14 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 First custom PCB KiCad files?
From the Apfelmark33/First-Custom-PCB-Controller repository on GitHub, at the commit this page was made from: the board is pcb_files/First_custom_PCB/First_custom_PCB.kicad_pcb and its schematic pcb_files/First_custom_PCB/First_custom_PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the First custom PCB design in my own project?
Its repository states no licence, so its author keeps all rights: ask Apfelmark33 before reusing the design.
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