6 open source boards using the PCA9555

Real designs built with the PCA9555, 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.

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The PCA9555 in open source designs

The gallery holds 6 open source boards using the PCA9555 from 3 GitHub repositories; a typical one measures about 95 × 80 mm and carries around 50 components.

100% are two-layer designs, the rest use four layers or more, and 67% carry an open source license.

The most starred is Domonode inputs by NdK73.

Parts used alongside the PCA9555

What boards using the PCA9555 are built for

Displays & LEDs 2

PCA9555: common questions

Where can I find a PCA9555 reference design?

Each of the 6 boards on this page is a real design using the PCA9555. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.

What parts are used alongside the PCA9555?

The 24LC02, HLK-PM01 and TLP620 appear in the most repositories here.

How big is a typical board using the PCA9555?

The median is 95 × 80 mm, and 100% are two-layer designs.

What is the most popular open source board using the PCA9555?

By GitHub stars, Domonode inputs by NdK73, with 5 stars.

Can I simulate one of these boards using the PCA9555 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.