2 layers116 × 102 mm
2 layers
Coin1
eutectic6337/coin13a challenge coin with blinky lights
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 28
- Pads
- 106
- Tracks, vias
- 209, 159
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Dec 2024
- Updated
- 18 May 2026
Overview
Coin1 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 with 55 parts on 28 nets, routed with 209 tracks and 159 vias.
It is built around the CH32V003F4U6. Its parts include 16 diodes, 8 resistors, 2 switches, 1 capacitor and 1 IC. It belongs with the RISC-V boards of this library.
Main components
1README
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
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | LED | LED_SMD:LED_0402_1005Metric | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 11 | TestPoint_Pad_D2.0mm | TestPoint:TestPoint_Pad_D2.0mm | stitch1, stitch1, stitch1, stitch1, stitch1, stitch1, stitch1, stitch1, stitch1, stitch1, stitch1 |
| 8 | 22R | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5, R6, R7, R8 |
| 7 | TestPoint_Pad_D1.0mm | TestPoint:TestPoint_Pad_D1.0mm | solder1, solder2, solder3, solder4, solder5, solder6, solder7 |
| 4 | align-r1, align-r2, align-r3, align-r4 | ||
| 2 | BAT- | TestPoint:TestPoint_Pad_D4.0mm | -, B1 |
| 2 | touch | TestPoint:TestPoint_Pad_D4.0mm | S1, S2 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | CH32V003F4U6 | Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm | U1 |
| 1 | Conn_01x03 | Connector_PinHeader_1.27mm:PinHeader_1x03_P1.27mm_Vertical | J1 |
| 1 | TestPoint_Pad_D4.0mm | TestPoint:TestPoint_Pad_D4.0mm | contact-r1 |
| 1 | TestPoint_THTPad_3.0x3.0mm_Drill1.5mm | TestPoint:TestPoint_THTPad_3.0x3.0mm_Drill1.5mm | battery-eject1 |
Questions
What parts does the Coin1 use?
55 parts, built around the CH32V003F4U6. 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 Coin1 KiCad files?
From the eutectic6337/coin1 repository on GitHub, at the commit this page was made from: the board is hardware/reverse/reverse.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 Coin1 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).
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