6 open source boards using the MCP23017-E_SP
Real designs built with the MCP23017-E_SP, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
ESP32Split flap
tinkermax
99.9 × 99.9 mm24 parts2LCC-BY-4.013
Muse MW Port Extender
CTDL
97.8 × 78.7 mm32 parts4LNo license6- schematic only · 10 partsSTM32
Hip
8adam95
10 partsNo license2 
RP2040/RP2350AKOR 01
arthurkowskii
114.5 × 162.3 mm60 parts2LNo license0
RGB LCD RPi3 HAT
CrtomirJuren
65 × 56 mm28 parts2LNo license0
Museduioon v3.1 I2C
96.5 × 63.5 mm19 parts4LNo license6
The MCP23017-E_SP in open source designs
The gallery holds 6 open source boards using the MCP23017-E_SP from 5 GitHub repositories; a typical one measures about 97.8 × 78.7 mm and carries around 26 components.
60% are two-layer designs, the rest use four layers or more, and 17% carry an open source license.
The most starred is Split flap by tinkermax.
Microcontrollers on boards using the MCP23017-E_SP
What boards using the MCP23017-E_SP are built for
MCP23017-E_SP: common questions
Where can I find a MCP23017-E_SP reference design?
Each of the 6 boards on this page is a real design using the MCP23017-E_SP. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the MCP23017-E_SP use?
Most are built on ESP32 (1), RP2040/RP2350 (1) and STM32 (1).
How big is a typical board using the MCP23017-E_SP?
The median is 97.8 × 78.7 mm, and 60% are two-layer designs.
What is the most popular open source board using the MCP23017-E_SP?
By GitHub stars, Split flap by tinkermax, with 13 stars.
Can I simulate one of these boards using the MCP23017-E_SP before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.