I2C communication is flexible, means the device which is powered by 5v volt, can use 5v for I2C and the 3.3v devices can use 3v for I2C communication. The voltage levels of I2C are not predefined. This way we can use the same bus to communicate with multiple devices.
When addressed only the slave with that particular address will reply back with the information while the others keep quit. Since there is more than one slave in the bus, the master has to refer to each slave using a different address.
#ARDUINO I2C EXAMPLE SLAVE SERIAL#
Serial Data (SDA): Sends the data to and from between the Master and slave.Īt any given time only the master will be able to initiate the communication. Serial Clock (SCL): Shares the clock signal generated by the master with the slave The complete communication takes place through these two wires namely, Serial Clock (SCL) and Serial Data (SDA). The advantage of I2C communication is that more than one slave can be connected to a Master. Communication should and will always occur between two a Master and a Slave. Here one device is called a master and the other device is called as slave. As said earlier it has two wires, these two wires will be connected across two devices. I2C communication was first introduced by Phillips. It has only two wires to share information out of which one is used for the cock signal and the other is used for sending and receiving data. I2C is a synchronous communication protocol meaning, both the devices that are sharing the information must share a common clock signal. It is normally denoted as I2C or I squared C or even as 2-wire interface protocol (TWI) at some places but it all means the same.
The term IIC stands for “ Inter Integrated Circuits”.
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