const int buzzer=5;         //pin 5 is the buzzer output
const int ir_led=4;         //pin 4 is the ir_led output
const int push_button=3;    //pin 3 is the push_button input
volatile byte alarm = LOW;  //alarm state = on or off

int noteArray[] = {740, 587};

void setup(){
  Serial.begin(9600);
  pinMode(buzzer,OUTPUT);       //configure pin 5 as OUTPUT
  pinMode(ir_led, OUTPUT);      //configure pin 4 as OUTPUT
  //pinMode(push_button,INPUT); //configure pin 3 as INPUT
  attachInterrupt(digitalPinToInterrupt(push_button), on_off, RISING);
}

void loop(){
  if (alarm){
    int sensor0=analogRead(A0);
    int sensor1=analogRead(A1);
  
    Serial.println((String)"sensor0 = " + sensor0);
    Serial.println((String)"sensor1 = " + sensor1);

    if(sensor0 < 1000){
      buzzer_sound(true);
    } else if (sensor1 < 1000) {
      buzzer_sound(false);
    } 
    
  }
}

void on_off(){
  static unsigned long last_interrupt_time = 0;
  unsigned long interrupt_time = millis();
  // if interrupts come faster than 500ms, assume it's a bounce and ignore
  if (interrupt_time - last_interrupt_time > 500){
    alarm = !alarm;
    //digitalWrite(ir_led, alarm);
    tone(ir_led, 38000);
  }
  last_interrupt_time = interrupt_time;
}

void buzzer_sound(bool in_out){
  noTone(ir_led);
  delay(100);
  if(in_out){
    for(int i = 0; i < 2; i++){
        tone(buzzer, noteArray[i], 750);
        delay(500);
    }
  } else {
    for(int i = 1; i > -1; i--){
        tone(buzzer, noteArray[i], 750);
        delay(500);
    }
  }
  noTone(buzzer);
  tone(ir_led, 38000);
  delay(2500);
}