Arduino Library and Titorial : https://playground•arduino•cc/Main/PCF8574Class https://playground•arduino•cc/Code/I2CPortExpan... http://www•instructables•com/id/Arduino-and-PCF... https://github•com/skywodd/pcf8574_arduino_library
Features:
I2C interface, I / O expansion module, two I / O scalability 8 I / O (up to 8 simultaneous use the PCF8574 expanded to 64 I / O) Most important feature: 1. Supports two interface types access target board: Pin or row seat, Support I2C bus cascade (by pin header row seat docking methods can be used simultaneously multiple I2C modules) Typical application: I / O resource shortage MCU I / O expansion Main resources: the PCF8574 I2C interface, 8-bit parallel Information includes: Test procedures (AVR, STM8, C8051F) Circuit schematics Related PDF data