| Index

| Reference for Wiring 1.0 (ALPHA) 0019+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Name |  | ### Wire
Examples |  |
    #include <TwoWire.h>

    void setup()
    {
      Wire.begin();        // join i2c bus (address optional for master)
      Serial.begin(9600);  // start serial for output
    }

    void loop()
    {
      Wire.requestFrom(2, 6);    // request 6 bytes from slave device #2

      while(Wire.available())    // slave may send less than requested
      {
        char c = Wire.receive(); // receive a byte as character
        Serial.print(c);         // print the character
      }

      delay(500);
    }
    #include <TwoWire.h>

    void setup()
    {
      Wire.begin(4);                // join i2c bus with address #4
      Wire.onReceive(receiveEvent); // register event
      Serial.begin(9600);           // start serial for output
    }

    void loop()
    {
      delay(100);
    }

    // function that executes whenever data is received from master
    // this function is registered as an event, see setup()
    void receiveEvent(int howMany)
    {
      while(1 < Wire.available()) // loop through all but the last
      {
        char c = Wire.receive(); // receive byte as a character
        Serial.print(c);         // print the character
      }
      int x = Wire.receive();    // receive byte as an integer
      Serial.println(x);         // print the integer
    }
Description |  | There is a TWI (Two Wire Interface) port available on the Wiring board named Wire. The port Wire is available on the Wiring I/O pins 0(SCL) and 1(SDA).
Syntax |  |
    Wire
Parameters |  |
Wire |  | The hardware TWI port
Methods |  |
available() |  |
beginTransmission() |  |
endTransmission() |  |
onReceive() |  |
onRequest() |  |
receive() |  |
requestFrom() |  |
send() |  |
Returns |  | None
Usage |  | Application