![]() ![]() Initiate communications they only respond to requests that are sent by the master device. ![]() The bus master is responsible for initiating all communications. And the SDA line from the master device connects to the SDA line on the slave device. So the SCLK line from the master device connects to the SCLK on the slave device. The diagram below shows the connection of an I 2C master device to its slave device.Īll that is necessary is for the master and slave each to get the power that it needs (V CC and GND) and for the clock and data lines In order to work, the 2 lines of the I 2C, the clock and data lines, need pull-up resistors to the positive I 2C protocol can incorporate multiple devices that all share the same communication lines: a clock signal (SCL)Īnd a bidirectional data line used for sending information back and forth between the master and slave (SDA). ![]() The protocol is known as the "two-wire" protocol because 2 lines are used for communication. The I 2C protocol was created by Phillips in the early 1980s and was standardized and adopted widespread The I 2C bus is a bus which enables high-speed two-way communication between devices while usingĪ minimal number of I/O pins to facilitate communication.Īn I 2C bus is controlled by a master device (usually a microcontroller) and contains one ore more slaveĭevices that receive information from the master device. In this project, we will show how to connect an I 2C device to an arduino microcontroller. How to Connect an I 2C Device to an Arduino Microcontroller ![]()
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