Reference for Wiring version 0024+. 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

Name

onRequest()

Examples
#include "TwoWire.h"

void setup()
{
  Wire.begin(2);                // join i2c bus with address #2
  Wire.onRequest(requestEvent); // register event
}

void loop()
{
  delay(100);
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
  Wire.send("hello "); // respond with message of 6 bytes
                       // as expected by master
}

Description The onRequest() method set the function that executes whenever data is requested by a master from this device. Every time a master reads data from this device the specified finction is executed.
Syntax
Wire.onRequest(function)
Parameters
function The name of the function to be called whenever data is requested by a master from this device
Wire The hardware TWI port
Returns None
Usage Application
Updated on November 01, 2009 09:16:04am PST

Creative Commons License