2 layers30 × 60 mm
Well depth battery
hansgaensbauer/Well-Monitor
Well monitoring equipment for Engineers Without Borders
63 parts20MIT
2 layers20.4 × 18.8 mm
Smolpad
ReFil/smolpadBaby macropad
- Size
- 20.4 × 18.8 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 22
- Nets
- 40
- Pads
- 117
- Tracks, vias
- 247, 28
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 17 Jul 2024
- Updated
- 11 Jan 2026
Overview
Smolpad is an open-source printed circuit board by ReFil, from the ReFil/smolpad repository on GitHub, published under the MIT licence. It is a 2-layer board of 20.4 × 18.8 mm with 22 parts on 40 nets, routed with 247 tracks and 28 vias.
It is built around the ATSAMD21E17D-MU. Its parts include 4 capacitors, 2 resistors, 2 ICs, 2 connectors and 1 switch. It belongs with the keyboards and input boards and the SAM D and SAM boards of this library.
Main components
1Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3, TP4, TP5, TP6 |
| 5 | SK6805-E-J | USB-C_PCB_experiments:SK6805-E-J | RGB1, RGB2, RGB3, RGB4, RGB5 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C4 |
| 1 | 100nF | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 1nF | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | 5.1k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | ATSAMD21E17D-M | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.6x3.6mm | U1 |
| 1 | Conn_ARM_SWD_TagConnect_TC2030-NL | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J1 |
| 1 | LDK130PU33R_DFN6 | Package_DFN_QFN:DFN-6_1.3x1.2mm_P0.4mm | U2 |
| 1 | PCB_USB_C_Receptacle | USB-C_PCB_experiments:usb-c-one-sided | J2 |
| 1 | SW_Push | Cherry_ULP:Cherry_ULP_SMD | SW1 |
Questions
How big is the Smolpad PCB?
It measures 20.4 × 18.8 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Smolpad use?
22 parts, built around the ATSAMD21E17D-MU. 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 Smolpad KiCad files?
From the ReFil/smolpad repository on GitHub, at the commit this page was made from: the board is smolpad.kicad_pcb and its schematic smolpad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Smolpad design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
Similar boards
- 4 layers24.5 × 45.9 mm
Servo
ReFil/gimbal-motor-servo
An ESC and firmware suitable for sensored 2205 gimbal motors
24 parts1MIT - 2 layers61 × 96.4 mm
- 2 layers158 × 11 mm
Daylight Matchstick
VoronDesign/Voron-Hardware
Cool Hardware designed by the Voron Design group
22 parts1.1kGPL-3.0 - 2 layers57 × 65 mm
Rgb to hdmi
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
22 parts1kGPL-3.0 - 2 layers81 × 57.2 mm
RP2040-Macropad
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
22 parts915 - 2 layers54.6 × 70.9 mm
BeagleLogic Cape
abhishek-kakkar/BeagleLogic
A Software Suite that implements a logic analyzer with the PRU on the BeagleBone / BeagleBone Black.
22 parts479GPL-3.0 - 2 layers66.4 × 24.5 mm
Connecting piece
Chrismettal/flipper-zero-backpacks
Backpack-style addon boards for the Flipper Zero!
22 parts456