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Libraries \ Encoder

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 | Encoder
Name |

### attach()

Examples |
    #include <Encoder.h>

    int val;
    Encoder myEncoder;

    void setup() {
      // ataches the encoder to pins EI2 and pin 8
      // EI2 is pin 18 on Wiring S
      // EI2 is pin 2 on Wiring v1
      myEncoder.attach(EI2, 8);
      myEncoder.write(0); // set the encoder position to 0
      Serial.begin(9600);
    }

    void loop() {
      // Reads the position or angle of the encoder variable
      val = myEncoder.read();          // read position
      Serial.print("Encoder is at: "); // print the position
      Serial.println(val);
      delay(100); // wait 100ms for next reading
    }
Description | The Wiring encoder library is based on external interruptions which can only happen on these specific pins. The phaseB cable can be connected to any other digital I/O pin of the Wiring I/O board. The attach(phaseAPin, phaseBPin) method attaches an Encoder variable to the pins where the encoder is connected.
Syntax |
    encoder.attach(pinA, pinB)
Parameters |

pinA | Encoder phase A pin. On Wiring v1 boards the external interrupts capable pins are: 0, 1, 2, 3, 36, 37, 38 and 39 named EI0, EI1, .. EI7 respectively. On Wiring S board the external interrupts capable pins are: 2, 3 and 18 named EI0, EI1 and EI2 respectively.
pinB | Encoder phase B pin, it can be any Wiring digital pin
encoder | The Encoder variable.

Returns | None
Usage | Application

Updated on July 07, 2011 11:09:54pm PDT