4 layers16.9 × 119.4 mm
4 layers40 × 22 mm
Falling sand
prestofuoco/falling-sandimu-enabled led matrix toy
- Size
- 40 × 22 mm
- Copper layers
- 4
- Thickness
- 1.56 mm
- Parts
- 179
- Nets
- 62
- Pads
- 463
- Tracks, vias
- 642, 239
- Pours
- 1,020
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Mar 2026
- Updated
- 15 Mar 2026
Overview
Falling sand is an open-source printed circuit board by prestofuoco, from the prestofuoco/falling-sand repository on GitHub. It is a 4-layer board of 40 × 22 mm with 179 parts on 62 nets, routed with 642 tracks and 239 vias.
It is built around the AP2112K-3.3TRG1. Its parts include 147 diodes, 13 capacitors, 7 resistors, 4 ICs and 1 connector. It belongs with the lEDs and displays boards and the STM32 boards of this library.
Main components
1Parts
179| Qty | Value | Footprint | References |
|---|---|---|---|
| 144 | LED | LED_SMD:LED_0402_1005Metric | D1, D10, D11, D100, D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112 +128 |
| 8 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C2, C3, C4, C5, C6, C7, C8, C9 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2, TP3, TP4, TP5 |
| 3 | 20K | Resistor_SMD:R_0402_1005Metric | R1, R2, R3 |
| 3 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C1, C10, C13 |
| 3 | D_Zener | Diode_SMD:D_SOD-882 | D145, D146, D147 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 2.2K | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 5.1K | Resistor_SMD:R_0402_1005Metric | R6, R7 |
| 1 | 120R @ 100MHz | Inductor_SMD:L_0805_2012Metric | FB1 |
| 1 | 16P USB-C Receptacle | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | AP2112K-3.3TRG1 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | IS31FL3731-QF | Package_DFN_QFN:QFN-28-1EP_4x4mm_P0.4mm_EP2.4x2.4mm | U1 |
| 1 | LOGO | LOGO | G*** |
| 1 | LSM6DSOTR | Package_LGA:LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U3 |
| 1 | STM32G491KEUx | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.45x3.45mm | U2 |
Questions
How big is the Falling sand PCB?
It measures 40 × 22 mm and has 4 copper layers, 1.56 mm thick.
What parts does the Falling sand use?
179 parts, built around the AP2112K-3.3TRG1. 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 Falling sand KiCad files?
From the prestofuoco/falling-sand repository on GitHub, at the commit this page was made from: the board is pcb/falling-sand.kicad_pcb and its schematic pcb/falling-sand.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Falling sand design in my own project?
Its repository states no licence, so its author keeps all rights: ask prestofuoco before reusing the design.
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