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

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