Code samples in the reference are released into the public domain. I2C does have several limitations however. Many displays and sensors interface to their host controller using I2C. Uses and Limitations I2C is used with microcontrollers like the Arduino and with microcomputers like the Raspberry Pi. The text of the Arduino reference is licensed under aĬreative Commons Attribution-ShareAlike 3.0 License. I2C is an abbreviation for Inter-Integrated Circuit. shift the value one bit to the right), yielding an address between 0 and 127.Ĭorrections, suggestions, and new documentation should be posted to the Forum. If you have a datasheet or sample code that uses 8 bit address, you'll want to drop the low bit (i.e. The Wire library uses 7 bit addresses throughout. ![]() 7 bits identify the device, and the eighth bit determines if it's being written to or read from. There are both 7- and 8-bit versions of I2C addresses. ![]() Because of this, send() and receive() have been replaced with read() and write(). On the Arduino Mega, SDA is digital pin 20 and SCL is 21.Īs of Arduino 1.0, the library inherits from the Stream functions, making it consistent with other read/write libraries. On most Arduino boards, SDA (data line) is on analog input pin 4, and SCL (clock line) is on analog input pin 5. At the top of the drop down list, select the option to 'Add. This library allows you to communicate with I2C / TWI devices. In the Arduino IDE, navigate to Sketch > Include Library > Add. Reference Language | Libraries | Comparison | Changes
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