Expose GPIO modules (Raspberry Pi, Beaglebone, PCF8754, PiFace2 etc.) and digital sensors (LM75 etc.) to an MQTT server for remote control and monitoring.

PCF8574 library. i2c digital expander for Arduino, Raspberry Pi Pico and rp2040 boards, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.

A library for driving LiquidCrystal displays (LCD) by using the I2C bus and an PCF8574 I2C adapter.

PCF8574 full function driver library for general MCU and Linux.

Arduino library for 4x4 (or smaller) keypad connected to an I2C PCF8574.

Userinterface for Volumio (RaspberryPi) with ssd1322 and ssd1306 oled display, spectrum bargraph, progress bar, LED functions, Standby-functions, 4 Buttons and Rotary Encoder.

This is an Arduino library for HD44780 LCD display, operated in 4 bit mode over I2C bus with 8-bit I/O expander PCF8574

Android Things open source peripheral drivers

MicroPython driver for PCF8574 8-Bit I2C I/O Expander with Interrupt

Arduino Relay controling sketch with multiple button types (mono-/bi-stable, reed switch), multiple actions (click, double-click, long-click) and MySensors protocol (Serial and MQTT)

Learning to programme the STM32F4 microprocessor via the Embedded.fm tutorial series

Projects and libraries for the Microchip PIC 16F1619 Microcontroller ( 8-bit, 20-pin).

A C++ Library to connect electronic displays to Raspberry Pi single board computers.

Two-Wire Interface (TWI) library for Arduino

Library to support the HD44780 LCD , (I2C PCF8574 "backpack" interface) for the Arduino eco system

C library for HD44780 LCD driver via I2C

A collection of projects and libraries for STM32 based micro-controllers family.

Use character liquid crystal display (LCD) in Elixir

i2c lcd STM32 library

A demo project using an ESP-01S and a pair of PCF8574 IO expansion boards.