arduino-sketches/door-sensor/door-sensor.ino

#include <IRremote.hpp>
#include "melody.h"

#define IR_RECEIVE_PIN 7



const int DOOR_SENSOR_PIN = 13;



/* Connections:
*  Door Sensor: Gnd & 13
*  Buzzer: Gnd & 8
*  Led Receptor: 7 & Gnd & 5V
*/




int currentDoorState; // current state of door sensor
int lastDoorState;    // previous state of door sensor

void setup()
{

  Serial.begin(115200); // // Establish serial communication
  IrReceiver.begin(IR_RECEIVE_PIN, ENABLE_LED_FEEDBACK); // Start the receiver
  pinMode(DOOR_SENSOR_PIN, INPUT_PULLUP);

  currentDoorState = digitalRead(DOOR_SENSOR_PIN); // read state

  if(useTimerFreeTone){
    Serial.println("configure to use timer free tone");
  }
}
int lastCmd;
unsigned long lastTime;

void loop() {

  handleDoor();

  if (IrReceiver.decode()) {
      // Serial.println(IrReceiver.decodedIRData.decodedRawData, HEX); // Print "old" raw data
      // IrReceiver.printIRResultShort(&Serial); // Print complete received data in one line
      // IrReceiver.printIRSendUsage(&Serial);   // Print the statement required to send this data
      // if(lastCmd == IrReceiver.decodedIRData.command && lastTime + 2000 > millis() )
      // {
      //   IrReceiver.resume();
      //   return;
      // }
      switch(IrReceiver.decodedIRData.command)
      {
        case 67:
          Serial.println("Play");
          playTone();
          break;
        default:
          Serial.print("unk: ");
          Serial.println(IrReceiver.decodedIRData.command);
      }
      
      //IrReceiver.printIRResultShort(&Serial); // Print complete received data in one line
      // lastTime = millis();
      // lastCmd=IrReceiver.decodedIRData.command;
      //Serial.println(IrReceiver.decodedIRData.command);

      IrReceiver.resume();
  }
  
}

void handleDoor(){
  lastDoorState = currentDoorState;              // save the last state
  currentDoorState  = digitalRead(DOOR_SENSOR_PIN); // read new state

  if (lastDoorState == LOW && currentDoorState == HIGH) { // state change: LOW -> HIGH
    Serial.println("The door-opening event is detected");
    playTone();
  }
  else
  if (lastDoorState == HIGH && currentDoorState == LOW) { // state change: HIGH -> LOW
    Serial.println("The door-closing event is detected");
    // TODO: turn off alarm, light or send notification ...
  }
}