GitHub

Arduino library for PCF8574 - 8 channel I2C IO expander.

The PCF8574_LH library provides a simple interface for controlling the PCF8574 I/O expander using the I2C communication protocol. It allows you to read and write values to the PCF8574's registers, ...
GitHub

Arduino library for MCP23017 16 channel I2C port expander.

REV D - June 2022 The I2C IO expander MCP23017 has changed according to the new data sheet. It is now a 14/16-bit IO expander. The pins GPA7 (7) and GPB7 (15) have lost their input mode, output mode ...
elektormagazine

Programming the Arduino in BASIC - Using I2C Part. 3

The I2C (Inter-Integrated Circuit) bus is a synchronous serial communication protocol that allows multiple electronic components (sensors, displays, memories, etc.) to be connected within the same ...