const int echoPin = A0;    // Define the Echo pin
const int tempPin = A1;    // Define the Temperature pin
const int triggerPin = 13;
 // Define the Trigger pin
int rev = 4;
const int fanPin = 2; 
 int door =  12 ;      // Define the Fan pin

long duration;             // Variable to store the duration of the sound wave
float distance;            // Variable to store the distance in centimeters
float temperature;         // Variable to store the temperature in Celsius

void setup() {
  pinMode(triggerPin, OUTPUT); // Set the Trigger pin as an output
  pinMode(echoPin, INPUT);     // Set the Echo pin as an input
  pinMode(fanPin, OUTPUT);  
  pinMode(door, OUTPUT); 
  pinMode(rev, OUTPUT);  // Set the Fan pin as an output
  
  Serial.begin(9600);          // Initialize the serial communication
}

void loop() {
  // Generate a pulse to the Trigger pin
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  
  // Measure the duration of the sound wave
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;
  
  // Read the temperature
  const float BETA = 3950; // should match the Beta Coefficient of the thermistor
int analogValue = analogRead(A1);
float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm, Temperature: ");
  Serial.print(celsius);
  Serial.println(" C");
  
  // If the distance is less than 20 cm, open the door
  if (distance < 60) {
    digitalWrite(door, HIGH);
     digitalWrite(rev, LOW);
    // Code to open the door goes here
  }
  else{
    digitalWrite(rev, HIGH);
    digitalWrite(door, LOW);
  }
  
  // If the temperature is greater than 25 C, turn on the fan
  if (celsius > 35) {
    Serial.println("Turning on fan");
    digitalWrite(2, HIGH);
    delay(1000);
  } else {
    digitalWrite(2, LOW);
  }
  
  delay(100); // Wait for half a second before taking another reading
}