Wire Slave Receiver
by Nicholas Zambetti <http://www.zambetti.com>

Demonstrates use of the Wire library Receives data as an I2C/TWI slave device Refer to the "Wire Master Writer" example for use with this

Created 29 March 2006
Revised 30 August 2007
 

    
// Wire Slave Receiver 
// by Nicholas Zambetti <http://www.zambetti.com> 

#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 
}