4 open source boards using the PCF8574AP
Real designs built with the PCF8574AP, 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.
The claw expansion board
askiiart
99.8 × 99.8 mm46 parts2LNo license1
RP2040/RP2350OpenDeck-RP2040-v0
Bugatsec
86.1 × 121.7 mm32 parts2LMIT1
ESP8266Split
dipa-cotton
251 × 148.4 mm239 parts2LNo license0
ESP8266Split left
217.6 × 150 mm194 parts2LNo license0
The PCF8574AP in open source designs
The gallery holds 4 open source boards using the PCF8574AP from 3 GitHub repositories; a typical one measures about 158.7 × 135 mm and carries around 120 components.
100% are two-layer designs, the rest use four layers or more, and 25% carry an open source license.
The most starred is The claw expansion board by askiiart.
Microcontrollers on boards using the PCF8574AP
What boards using the PCF8574AP are built for
PCF8574AP: common questions
Where can I find a PCF8574AP reference design?
Each of the 4 boards on this page is a real design using the PCF8574AP. 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 PCF8574AP use?
Most are built on ESP8266 (2) and RP2040/RP2350 (1).
How big is a typical board using the PCF8574AP?
The median is 158.7 × 135 mm, and 100% are two-layer designs.
What is the most popular open source board using the PCF8574AP?
By GitHub stars, The claw expansion board by askiiart, with 1 stars.
Can I simulate one of these boards using the PCF8574AP 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.