![]() If the master wants to receive the data, it only generates clock pulses. Thus a maximum of 127 slaves with unique addresses can be connected to a single master.Īfter each byte, the receiver must send a 0 to acknowledge the reception of the byte The first byte sent by the master contains a seven-bit address and a read/ write bit indicating whether the next bytes will come from the master or should come from the slave. The slaves are not selected via a slave select line, but via address bits. ![]() I2C is synchronous because it uses a clock. It uses only two lines: One for data (SDA) and one for clock (SCL). Arduino refers to I2C as Wire, which is a shorter form of the term Atmel uses (Two Wire Interface or TWI). It is a popular communication protocol used by several peripherals like accelerometer and gyroscopes, OLED Displays, etc.
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