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Libraries \ Wire

Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Class | Wire
Name |

### requestFrom()

Examples |
    #include "Wire.h"

    void setup()
    {
      Wire.begin();        // join i2c bus (address optional for master)
      Serial.begin(9600);  // start serial for output
    }

    void loop()
    {
      Wire.requestFrom(2, 6); // request 6 bytes from slave device #2

      while(Wire.available()) // slave may write less than requested
      {
        char c = Wire.read(); // read a byte as character
        Serial.print(c);      // print the character
      }

      delay(500);
    }

Description | The requestFrom() method start read a specified number of bytes from the device specified with a given address.
Syntax |
    Wire.requestFrom(address, quantity)
Parameters |

address | An int number between 0 and 127 specifying the address of the device to be read.
quantity | An int number specifying the number of bytes to be read.
Wire | The hardware TWI port

Returns | int: The number of bytes read.
Usage | Application

Updated on July 07, 2011 11:12:06pm PDT