Arduino UNO - Rotary Encoder

Exemple 1: Fa una sortida per el port serial

/* Read Quadrature Encoder   * Connect Encoder to Pins encoder0PinA, encoder0PinB, and +5V.   *   * Sketch by max wolf / www.meso.net   * v. 0.1 - very basic functions - mw 20061220   *   */   int val;  int encoder0PinA = 11;  int encoder0PinB = 12;  int encoder0Pos = 0;  int encoder0PinALast = LOW;  int n = LOW;  void setup() {    pinMode (encoder0PinA,INPUT);    pinMode (encoder0PinB,INPUT);    Serial.begin (9600);  }  void loop() {    n = digitalRead(encoder0PinA);    if ((encoder0PinALast == LOW) && (n == HIGH)) {      if (digitalRead(encoder0PinB) == LOW) {        encoder0Pos--;      } else {        encoder0Pos++;      }      Serial.print (encoder0Pos);      Serial.println ("/");    }    encoder0PinALast = n;  }

Exemple 2: Variació de la brillantor de un led (PWM)

/* ** Rotary Encoder Example ** Use the Sparkfun Rotary Encoder to vary brightness of LED ** ** Sample the encoder at 200Hz using the millis() function */ int brightness = 120;    // how bright the LED is, start at half brightness int fadeAmount = 10;    // how many points to fade the LED by unsigned long currentTime; unsigned long loopTime; const int pin_A = 12;  // pin 12 const int pin_B = 11;  // pin 11 unsigned char encoder_A; unsigned char encoder_B; unsigned char encoder_A_prev=0; void setup()  {   // declare pin 9 to be an output:   pinMode(9, OUTPUT);   pinMode(pin_A, INPUT);   pinMode(pin_B, INPUT);   currentTime = millis();   loopTime = currentTime; } void loop()  {   // get the current elapsed time   currentTime = millis();   if(currentTime >= (loopTime + 5)){     // 5ms since last check of encoder = 200Hz      encoder_A = digitalRead(pin_A);    // Read encoder pins     encoder_B = digitalRead(pin_B);       if((!encoder_A) && (encoder_A_prev)){       // A has gone from high to low       if(encoder_B) {         // B is high so clockwise         // increase the brightness, dont go over 255         if(brightness + fadeAmount <= 255) brightness += fadeAmount;                      }         else {         // B is low so counter-clockwise              // decrease the brightness, dont go below 0         if(brightness - fadeAmount >= 0) brightness -= fadeAmount;                     }       }       encoder_A_prev = encoder_A;     // Store value of A for next time            // set the brightness of pin 9:     analogWrite(9, brightness);          loopTime = currentTime;  // Updates loopTime   }   // Other processing can be done here                            }