Using The PCF8575 i2c i/o Expander To Read Inputs With Arduino

This Instructable will show you just how easy it is to add extra inputs to your Arduino. You can use this technique to add hundreds of extra inputs to your Arduino with only two wires by using a fancy communication protocol called i2c (eye-squared-see). Step 1: Build The Circuit The SDA and SCL lines enable i2c communication.Which pins are SDA and SCL? Uno, Ethernet: A4 (SDA), A5 (SCL) Mega2560: 20 (SDA), 2 ...

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