2 layers116 × 102 mm
2 layers50 × 48.6 mm
Internal
eutectic6337/coin13a challenge coin with blinky lights
- Size
- 50 × 48.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 2
- Pads
- 48
- Tracks, vias
- 6, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Dec 2024
- Updated
- 18 May 2026
Overview
Internal is an open-source printed circuit board by eutectic6337, from the eutectic6337/coin1 repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 50 × 48.6 mm with 48 parts on 2 nets, routed with 6 tracks and 0 vias.
README
README.mdcoin1
challenge coin with blinky lights
Feature: Using 8 PWM channels to provide dimming function for 16 LEDs by connecting pairs in anti-parallel between a PWM pin and a GPIO.
built as a stack of 3 PCBs - components mounted on top of bottom board, second board has a cutout to fit a battery and for each mounted component, and top board has holes to transmit light from LEDs
finished coin to have [relatively] smooth top and bottom
using JLCPCB's serial-number mechanism to put a unique number on each coin
Initial code flashed onto these is a modified version of the Arduino Blink demo.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | TestPoint_THTPad_3.0x3.0mm_Drill1.5mm | TestPoint:TestPoint_THTPad_3.0x3.0mm_Drill1.5mm | clearance-D1, clearance-D2, clearance-D3, clearance-D4, clearance-D5, clearance-D6, clearance-D7, clearance-D8, clearance-D9, clearance-D10, clearance-D11, clearance-D12, clearance-D13, clearance-D14, clearance-D15, clearance-D16 +9 |
| 11 | TestPoint_Pad_D2.0mm | TestPoint:TestPoint_Pad_D2.0mm | stitch2, stitch2, stitch2, stitch2, stitch2, stitch2, stitch2, stitch2, stitch2, stitch2, stitch2 |
| 7 | TestPoint_THTPad_D2.0mm_Drill1.0mm | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | through-i1, through-i2, through-i3, through-i4, through-i5, through-i6, through-i7 |
| 4 | align-i1, align-i2, align-i3, align-i4 | ||
| 1 | TestPoint_Pad_D4.0mm | TestPoint:TestPoint_Pad_D4.0mm | contact-i1 |
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Questions
How big is the Internal PCB?
It measures 50 × 48.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Internal use?
48 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 Internal KiCad files?
From the eutectic6337/coin1 repository on GitHub, at the commit this page was made from: the board is hardware/internal/internal.kicad_pcb and its schematic hardware/smd0201/smd0201.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Internal design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).