Example of such I2C capable system are LCD, EEPROM, different types of sensors such as temperature sensor, pressure sensors, accelerometers and others. I2C serial communication is designed to connect number of integrated circuit which is cable of I2C communication. If two devices of different system like two Arduino are used for I2C communication another wire which is the ground wire is required. It is also called Two Wire Interface (shortened to TWI) because it uses two wire when the two I2C devices are within the same system. I2C is acronym for Inter-Integrated Circuit which is a serial communication standard developed by Philips Semiconductor in 1982. One Arduino is configured as a master and the other is configured as slave. Hence it is useful if I/O capability is to be increased or if more processing is required. This is useful if we want to transfer data from one Arduino to another or control sensors or actuator connected to one Arduino with another Arduino. In this tutorial we will show how two Arduino can be communicated using I2C communication protocol.
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