#include <DHT.h>

#define DHTPIN 2     // Pin for the DHT sensor
#define DHTTYPE DHT11   // DHT 11 

#define TRIG_PIN 9  // Pin for the Ultrasonic sensor's TRIG
#define ECHO_PIN 10 // Pin for the Ultrasonic sensor's ECHO
#define LED_PIN 13  // Pin for the LED

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // Read temperature
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Read distance from ultrasonic sensor
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Calculate distance in cm

  // Print sensor readings to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" *C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Control LED based on distance
  if (distance < 50) { // Example condition: if an object is within 50 cm
    digitalWrite(LED_PIN, HIGH); // Turn on LED
  } else {
    digitalWrite(LED_PIN, LOW); // Turn off LED
  }

  // Control LED based on temperature (example condition)
  if (temperature > 30) { // Example condition: if temperature is greater than 30°C
    digitalWrite(LED_PIN, HIGH); // Turn on LED
  } else {
    digitalWrite(LED_PIN, LOW); // Turn off LED
  }

  delay(2000); // Wait for 2 seconds before repeating the loop
}