Misc Projects Arduino and a PCF8574 port expander by shedboy71 29th February 2016 The PCF8574 is an 8 bits I/O port expander that uses the I2C protocol. Using this IC, you can use only the SDA and SCL pins of your Arduino board to control up to 8 digital I/O ports. A0,A1,A2 are address … Read more
