3 open source boards using the PCF8574T-keypad-expander
Real designs built with the PCF8574T-keypad-expander, 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.
ESP32Mesh phone
JeremyLakeyJr
87 × 154 mm95 parts2LNo license0
ESP32Owasso1-before rf ground finish
87 × 154 mm95 parts2LNo license0
ESP32Owasso1-unrouted
87 × 154 mm95 parts2LNo license0
The PCF8574T-keypad-expander in open source designs
The gallery holds 3 open source boards using the PCF8574T-keypad-expander from 1 GitHub repository; a typical one measures about 87 × 154 mm and carries around 95 components.
100% are two-layer designs, the rest use four layers or more, and 0% carry an open source license.
The most starred is Mesh phone by JeremyLakeyJr.
Microcontrollers on boards using the PCF8574T-keypad-expander
What boards using the PCF8574T-keypad-expander are built for
PCF8574T-keypad-expander: common questions
Where can I find a PCF8574T-keypad-expander reference design?
Each of the 3 boards on this page is a real design using the PCF8574T-keypad-expander. 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 PCF8574T-keypad-expander use?
Most are built on ESP32 (3).
How big is a typical board using the PCF8574T-keypad-expander?
The median is 87 × 154 mm, and 100% are two-layer designs.
What is the most popular open source board using the PCF8574T-keypad-expander?
By GitHub stars, Mesh phone by JeremyLakeyJr, with 0 stars.
Can I simulate one of these boards using the PCF8574T-keypad-expander 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.