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  

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