Reference for Wiring version 0027+. 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.
Class | Wire |
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Name | begin() |
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Examples | #include "Wire.h" void setup() { // join i2c bus (address optional for master) Wire.begin(); // start serial for output Serial.begin(9600); } void loop() { // request 6 bytes from slave device #2 Wire.requestFrom(2, 6); // slave may send less than requested while(Wire.available()) { // receive a byte as character char c = Wire.receive(); Serial.print(c); // print the character } delay(500); } #include "Wire.h" void setup() { // join i2c bus with address #4 Wire.begin(4); // register event Wire.onReceive(receiveEvent); // start serial for output Serial.begin(9600); } 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) { // loop through all but the last while(1 < Wire.available()) { // receive byte as a character char c = Wire.receive(); Serial.print(c); // print the character } // receive byte as an integer int x = Wire.receive(); Serial.println(x); // print the integer } |
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Description | The Wiring TwoWire library allows for easily reading and writing data to external devices using the Two Wire Interface (TWI or I2C) protocol. The TWI protocol and interface were developed by Phillips. The TWI pins are available on the Wiring I/O board on pins 0 (SCL) and 1 (SDA). It is possible to connect multiple TWI devices to the TWI pins creating a network or bus of devices and communicate with them by means of an address. The TWI can be configured to act as a Master or a Slave in a network of devices. The begin() method is used to initiate the TWI as a Master and the begin(address) method is used to join the TWI bus a slave using the address specified. In both cases the begin method must be must be placed in the setup() method. | ||||
Syntax | Wire.begin() |
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Parameters |
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Returns | None | ||||
Usage | Application |