user14265: How does the arduino uno talk with i2c? i saw the circuit and it use analog input pins but as far as i know you cant use them as output. How does he send data over those pins?

user4143: Most pins on the Arduino are multi-function and can be switched into different modes. Analog is just one of those modes. I2C is one of the available modes for the pins that A4 and A5 are connected to.

14265: <p>How does the arduino uno talk with i2c? i saw the circuit and it use analog input pins but as far as i know you cant use them as output. How does he send data over those pins?</p>
 4143: <p>Most pins on the Arduino are multi-function and can be switched into different modes. Analog is just one of those modes. I2C is one of the available modes for the pins that A4 and A5 are connected to.</p>
