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
MegaIOHat
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
- 18
- Nets
- 40
- Pads
- 156
- Tracks, vias
- 181, 48
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 18 Dec 2016
- Updated
- 18 Jan 2026
Overview
MegaIOHat 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 18 parts on 40 nets, routed with 181 tracks and 48 vias.
It is built around the MCP23017-E/SS. Its parts include 6 connectors, 4 resistors, 2 capacitors 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
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | RPi_Hat:RPi_Hat_Mounting_Hole | H1, H2, H3, H4 | |
| 4 | 10K Ohms | R1 | R101, R102, R103, R301 |
| 2 | .1 uf | C1 | C201, C301 |
| 2 | MCP23017 | DIP-28__300 | U201, U301 |
| 1 | 0 1 | PIN_ARRAY_2X2 | P101 |
| 1 | GPIO 1 | vasch_strip_5x2 | P201 |
| 1 | GPIO 2 | vasch_strip_5x2 | P202 |
| 1 | GPIO 3 | vasch_strip_5x2 | P301 |
| 1 | GPIO 4 | vasch_strip_5x2 | P302 |
| 1 | RPi_GPIO | RPi_Hat:Pin_Header_Straight_2x20 | J0 |
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Questions
How big is the MegaIOHat PCB?
It measures 65 × 56 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MegaIOHat use?
18 parts, built around the MCP23017-E/SS. 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 MegaIOHat KiCad files?
From the RobertPHeller/RPi-RRCircuits repository on GitHub, at the commit this page was made from: the board is MegaIOHat/MegaIOHat.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the MegaIOHat design in my own project?
Its repository states no licence, so its author keeps all rights: ask RobertPHeller before reusing the design.