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Standard interface that can be expanded in a variety of development boards. I2C Serial port to 8-bit parallel port , support expand into 8×8 = 64 at most. PCF8574 IO expansion chip with I2C interface, 8-bit parallel port output. Applicable to a variety of platforms including Arduino / AVR / ARM. Based on the I2C interface I / O expansion modules, use two I / O scalability eight I / O (up to 8 simultaneous use PCF8574, expanded to 64 I / O).