Arduino shutter

arduino-shutter.ino

/**
 * @author http://servuc.github.io
 * 
 * This code is in public domain
 * It's was create for the instructable :
 * 
 * http://www.instructables.com/id/Arduino-Shutter-Opener
 */
#define SWITCH_DOWN_PIN 2
#define SWITCH_UP_PIN 3

#define LIGHT_SENSOR_PIN 4

#define RELAY_DOWN_PIN 6
#define RELAY_UP_PIN 5

#define SHUTTER_UP 2
#define SHUTTER_DOWN 1
#define SHUTTER_STOP 0

#define MILLI_TIME_TO_MOVE_ALL 5000
#define MILLI_TIME_TO_MOVE_PARTIALLY 500
#define MILLI_TIME_TO_SLEEP 10000

int mPreviousDayLight = LOW;

void setup()
{
  //Detect move from wall switch
  pinMode(SWITCH_DOWN_PIN, INPUT);
  pinMode(SWITCH_UP_PIN, INPUT);
  attachInterrupt(SWITCH_DOWN_PIN, loop, CHANGE);
  attachInterrupt(SWITCH_UP_PIN, loop, CHANGE);

  //Detect light
  pinMode(LIGHT_SENSOR_PIN, INPUT);
  mPreviousDayLight = digitalRead(LIGHT_SENSOR_PIN);

  //Activate relay moving
  pinMode(RELAY_DOWN_PIN, OUTPUT);
  pinMode(RELAY_UP_PIN, OUTPUT);

  //Default position for relay
  digitalWrite(RELAY_DOWN_PIN, LOW);
  digitalWrite(RELAY_UP_PIN, LOW);

  Serial.begin(9600);
}

void actionDownShutter()
{
  Serial.println("Shutter down !");
  digitalWrite(RELAY_DOWN_PIN, HIGH);
  digitalWrite(RELAY_UP_PIN, LOW);
}

void actionHighShutter()
{
  Serial.println("Shutter up !");
  digitalWrite(RELAY_DOWN_PIN, LOW);
  digitalWrite(RELAY_UP_PIN, HIGH);
}

void actionStopShutter()
{
  Serial.println("Shutter stop !");
  digitalWrite(RELAY_DOWN_PIN, LOW);
  digitalWrite(RELAY_UP_PIN, LOW);
}

void loop()
{
  //Detect day light
  //LOW = night, HIGH = SUN
  int lightStatus = digitalRead(LIGHT_SENSOR_PIN);

  //Detect physical switch
  //If to prevent bug
  int switchStatus = SHUTTER_STOP;
  if(digitalRead(SWITCH_DOWN_PIN) != digitalRead(SWITCH_UP_PIN)) {
    //Get actual position
    if(digitalRead(SWITCH_DOWN_PIN) == HIGH) {
      switchStatus = SHUTTER_DOWN;
    }
    if(digitalRead(SWITCH_UP_PIN) == HIGH) {
      switchStatus = SHUTTER_UP;
    }
  }

  //Display some informations
  Serial.print("Light : ");
  Serial.print((lightStatus != HIGH) ? "Sun" : "Moon");
  Serial.print(" | Previous : ");
  Serial.println((mPreviousDayLight != HIGH) ? "Sun" : "Moon");
  Serial.print("Switch : ");
  Serial.println(switchStatus);

  if(lightStatus != mPreviousDayLight && switchStatus == SHUTTER_STOP)
  {
    //night
    if(lightStatus == HIGH) 
    {
      actionDownShutter();
    }
    else {
      actionHighShutter();
    }
    delay(MILLI_TIME_TO_MOVE_ALL);
    actionStopShutter();
    mPreviousDayLight = lightStatus;
  }
  else
  {
    //Move to switch position
    switch(switchStatus)
    {
    case SHUTTER_UP :
      actionHighShutter();
      delay(MILLI_TIME_TO_MOVE_PARTIALLY);
      break;

    case SHUTTER_DOWN :
      actionDownShutter();
      delay(MILLI_TIME_TO_MOVE_PARTIALLY);
      break;

    default :
      actionStopShutter();
      delay(MILLI_TIME_TO_SLEEP);
      break;
    } 
  }
  //Prevent from useless looping
}