3

Can I change the pins on the communication for a Master-Slave arduino Wire transmission? I want to communicate between 2 arduinos, but on one of them A4&A5 are taken

4

You cannot. Wire uses hardware I2C, and on the Uno only A4 and A5 are connected to the TWI peripheral on the MCU. You will need to either switch to a bit-bang I2C implementation or change the protocol you're using.

1

To complete Ignacio's answer, there's indeed no other hardware I2C on AVR Arduinos.

The only options you have to use other pins is:

  • to use bitbang i2c, which is way slower ;
  • or you can switch to the Arduino Due which features two TWI ports ;
  • or you can use an SPI to I2C serial bridge such has that one.

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