Hence, it is sometimes also known as TWI (Two Wire Interface). Code samples in the reference are released into the public domain.I2C or I 2C is short for Inter-Integrated Circuit, a synchronous serial communication protocol developed by Phillips for communication between a fast Microcontroller and relatively slow peripherals (like Memory or Sensors) using just two wires. The text of the Arduino reference is licensed under aĬreative Commons Attribution-ShareAlike 3.0 License.
Add SerCom : Adding mores Serial interfaces to SAMD microcontrollers.Ĭorrections, suggestions, and new documentation should be posted to the Forum. SFR Ranger Reader: Read an ultra-sonic range finder interfaced via the I2C. Master Writer/Slave receiver:Program two Arduino boards to communicate with one another in a Master Writer/Slave Receiver configuration via the I2C. Master Reader/Slave Writer: Program two Arduino boards to communicate with one another in a Master Reader/Slave Sender configuration via the I2C. Digital Potentiometer: Control an Analog Devices AD5171 Digital Potentiometer. Exceeding bytes in a single transmission will just be dropped. The Wire library implementation uses a 32 byte buffer, therefore any communication should be within this limit. MEGA 2560 board has pull-up resistors on pins 20 - 21 onboard. Please refer to the examples for more informations. Please note that a pull-up resistor is needed when connecting SDA/SCL pins. However the addresses from 0 to 7 are not used because are reserved so the first address that can be used is 8. shift the value one bit to the right), yielding an address between 0 and 127. 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(). The Arduino Due has two I2C / TWI interfaces SDA1 and SCL1 are near to the AREF pin and the additional one is on pins 20 and 21.Īs a reference the table below shows where TWI pins are located on various Arduino boards.Īs of Arduino 1.0, the library inherits from the Stream functions, making it consistent with other read/write libraries. 
On the Arduino boards with the R3 layout (1.0 pinout), the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin.
This library allows you to communicate with I2C / TWI devices. Reference Language | Libraries | Comparison | Changes
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