2

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?

Improve this question
2

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.

Improve this answer
7
  • But i cant change it using pinMode(Output), or can i? – MyNick Oct 23 '15 at 16:42
  • 1
    pinMode(OUTPUT) will put the pin into digital IO mode and set it to output - just like every other pin. – Majenko♦ Oct 23 '15 at 16:43
  • but i give it the index of the io pin (to the function), what values i give for the analog pins? – MyNick Oct 23 '15 at 16:43
  • Either the name (A3 for example) or 14 - 19 following on from the highest numbered digital pin D13. – Majenko♦ Oct 23 '15 at 16:44
  • Wow didnt know that, thank you. And then its just a regular output io? – MyNick Oct 23 '15 at 16:45

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.