Reference for Wiring version 0023+. 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 | onRequest() |
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| 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
} |
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| 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) |
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| Parameters |
|
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| Returns | None | ||||
| Usage | Application |
