closet.ino

/**
 * PIR Closet Sensor, with kill switch.
 */

const int relayPin  = D1;
const int pirSensor = D2;
const int btnSensor = D8;

int pir      = 0;   // Variable for pir.
int pirState = LOW; // Start as off.
int btn      = 0;   // Variable for button.
int btnState = LOW; // Start as off.

void setup() {
  Serial.begin( 9600 );
  Serial.println();
  Serial.println( "Starting up..." );

  pinMode( relayPin, OUTPUT );
  pinMode( pirSensor, INPUT );
  pinMode( btnSensor, INPUT );
}

void loop() {
  btn = digitalRead( btnSensor );
  pir = digitalRead( pirSensor );
  
  // If a button is pushed, and motion is detected,
  // turn off the light and wait until it resets.
  if ( HIGH == btn && LOW == btnState && HIGH == pir ) {
    digitalWrite( relayPin, LOW );
    btnState = HIGH;
    Serial.println( "Killswitch detected -- turning off light." );
    delay( 1000 );
    return;
  }

  // If the button was pressed, keep shorting
  // until the pir goes low again.
  if ( HIGH == btnState ) {
    if ( LOW == pir ) {
      Serial.println( "No motion, resetting state." );
      btnState = LOW;
    }
    if ( HIGH == btn ) {
      Serial.println( "Button pressed, turning light back on." );
      digitalWrite( relayPin, HIGH );
      btnState = LOW;
    }
    return;
  }

  // If the pir senses light, 
  if ( HIGH == pir ) {
    digitalWrite( relayPin, HIGH );
    if ( LOW == pirState ) {
      Serial.println( "Motion detected!" );
      pirState = HIGH;
    }
  } else {
    digitalWrite( relayPin, LOW );
    if ( HIGH == pirState ) {
      Serial.println( "Motion ended." );
      pirState = LOW;
    }
  }
}