encoder_lcd.ino

// -----
// InterruptRotator.ino - Example for the RotaryEncoder library.
// This class is implemented for use with the Arduino environment.
// Copyright (c) by Matthias Hertel, http://www.mathertel.de
// This work is licensed under a BSD style license. See http://www.mathertel.de/License.aspx
// More information on: http://www.mathertel.de/Arduino
// -----
// 18.01.2014 created by Matthias Hertel
// -----

// This example checks the state of the rotary encoder in the loop() function.
// The current position is printed on output when changed.

// Hardware setup:
// Attach a rotary encoder with output pins to A2 and A3.
// The common contact should be attached to ground.
#include <LiquidCrystal.h>

#include <RotaryEncoder.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 7, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// Setup a RoraryEncoder for pins A2 and A3:
RotaryEncoder encoder(A2, A3);

#define ROTARYSTEPS 10
#define ROTARYMIN 0
#define ROTARYMAX 255
int lastPos = -1;

void setup()
{
  Serial.begin(57600);
  Serial.println("SimplePollRotator example for the RotaryEncoder library.");

  // You may have to modify the next 2 lines if using other pins than A2 and A3
  PCICR |= (1 << PCIE1);    // This enables Pin Change Interrupt 1 that covers the Analog input pins or Port C.
  PCMSK1 |= (1 << PCINT10) | (1 << PCINT11);  // This enables the interrupt for pin 2 and 3 of Port C.
} // setup()



// The Interrupt Service Routine for Pin Change Interrupt 1
// This routine will only be called on any signal change on A2 and A3: exactly where we need to check.
ISR(PCINT1_vect) {
  encoder.tick(); // just call tick() to check the state.
}


// Read the current position of the encoder and print out when changed.
void loop()
{
  int newPos = encoder.getPosition();

  if (newPos < ROTARYMIN) {
    encoder.setPosition(ROTARYMIN / ROTARYSTEPS);
    newPos = ROTARYMIN;

  } else if (newPos > ROTARYMAX) {
    encoder.setPosition(ROTARYMAX / ROTARYSTEPS);
    newPos = ROTARYMAX;
  } // if

  if (lastPos != newPos) {
    Serial.print(newPos);
    lcd.print(newPos / 10);
    Serial.println();
    lastPos = newPos;
    if (newPos == 66)
      delay(6600);
  } // if

} // loop ()

// The End