#define PIN_TRIG 26
#define PIN_ECHO 25
#define green_lid 18
#define red_lamp 22
#define buzz_pickup 21
#define pir 27
#define ldr 13

int pirState = LOW;

void setup() 
{
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(green_lid, OUTPUT);
  pinMode(red_lamp, OUTPUT);
  pinMode(pir, INPUT);
  pinMode(buzz_pickup, OUTPUT);
  pinMode(ldr, INPUT);
}

void loop() 
{
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  int value1 = analogRead(ldr);
  int value2 = digitalRead(pir);
  int duration = pulseIn(PIN_ECHO, HIGH);
  int distanceCM = duration / 58;

  Serial.print("Distance in CM: ");
  Serial.println(distanceCM);
  Serial.print("Value ldr(photoresistor): ");
  Serial.println(value1);
  Serial.print("Value motion sensor: ");
  Serial.println(value2);

  if(distanceCM < 20 && (value2 == LOW || value2 == HIGH)&& value1 <400)
  {
    Serial.println("Notification send");
    tone(buzz_pickup, 150);
    delay(1000);
    noTone(buzz_pickup);
    delay(1000);
  }
  else if(distanceCM > 20 && value2 == HIGH && (value1 < 400 || value1 > 400) )
  {
    digitalWrite(green_lid, HIGH);
    if (pirState == LOW) 
    {
      Serial.println("Motion detected! Lid open");
      pirState = HIGH;
    }
  }
  else if((distanceCM < 20 || distanceCM > 20)&& value2 == HIGH && value1 > 400)
  {
    digitalWrite(red_lamp, HIGH);
    Serial.println("LED lamp turned on");
    if (pirState == LOW) 
    {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
  }
  else
  {
    noTone(buzz_pickup);
    digitalWrite(red_lamp, LOW);
    digitalWrite(green_lid, LOW);
  }
}