Top 4 pcf8574 open source projects

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

pcf8574 full function driver

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

i2c digital expander for Arduino, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.