Description
This function writes data from a peripheral device in response to a request from a controller device, or queues bytes for transmission from a controller to peripheral device (in-between calls to beginTransmission() and endTransmission()).
Syntax
Wire.write(value)
Wire.write(string)
Wire.write(data, length)
Parameters
-
value: a value to send as a single byte.
-
string: a string to send as a series of bytes.
-
data: an array of data to send as bytes.
-
length: the number of bytes to transmit.
Returns
The number of bytes written (reading this number is optional).
Example
#include <Wire.h>
byte val = 0;
void setup() {
Wire.begin(); // Join I2C bus
}
void loop() {
Wire.beginTransmission(44); // Transmit to device number 44 (0x2C)
Wire.write(val); // Sends value byte
Wire.endTransmission(); // Stop transmitting
val++; // Increment value
// if reached 64th position (max)
if(val == 64) {
val = 0; // Start over from lowest value
}
delay(500);
}