2 layers156.2 × 168.9 mm
LPC176x MultiFunction
RobertPHeller/RPi-RRCircuits
A collection of circuit designs for various MCUs, not just Raspberry Pis relating to Model Railroading
236 parts24
2 layers65 × 56 mm
ButtonHat
RobertPHeller/RPi-RRCircuits24A collection of circuit designs for various MCUs, not just Raspberry Pis relating to Model Railroading
- Size
- 65 × 56 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 43
- Pads
- 167
- Tracks, vias
- 349, 25
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 18 Dec 2016
- Updated
- 18 Jan 2026
Overview
ButtonHat is an open-source printed circuit board by RobertPHeller, from the RobertPHeller/RPi-RRCircuits repository on GitHub. It is a 2-layer board of 65 × 56 mm with 40 parts on 43 nets, routed with 349 tracks and 25 vias.
It is built around the 74AHC14D. Its parts include 14 capacitors, 12 resistors, 5 connectors and 2 ICs. It belongs with the ESP32 boards of this library.
Main components
1README
16LEDDriver23017SMD/README.md16LEDDriver23017SMD
This is a SMD variant of 16DriverOutputHAT.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 10 nf | C2 | C1, C2, C3, C4, C5, C6, C9, C10, C11, C12, C13, C14 |
| 12 | 10K Ohms | R1 | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12 |
| 4 | RPi_Hat:RPi_Hat_Mounting_Hole | H1, H2, H3, H4 | |
| 2 | .1 uf | C1 | C7, C8 |
| 2 | 74AHC14 | DIP-14__300 | U1, U2 |
| 2 | Buttons 7 to 12 | PIN_ARRAY-6X1 | J2, T3 |
| 1 | DWSLogoBCU | ||
| 1 | Buttons 1 to 6 | PIN_ARRAY-6X1 | T1 |
| 1 | Buttons 1 to 6 | PIN_HEADER-6X1 | J1 |
| 1 | GPIO | PIN_HEADER_17x1 | J3 |
| 1 | Ground | PIN_ARRAY_2X1 | T2 |
| 1 | RPI_GPIO | RPi_Hat:Pin_Header_Straight_2x20 | J0 |
Questions
How big is the ButtonHat PCB?
It measures 65 × 56 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ButtonHat use?
40 parts, built around the 74AHC14D. 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 ButtonHat KiCad files?
From the RobertPHeller/RPi-RRCircuits repository on GitHub, at the commit this page was made from: the board is ButtonHat/ButtonHat.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ButtonHat design in my own project?
Its repository states no licence, so its author keeps all rights: ask RobertPHeller before reusing the design.
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