#include<DHT.h>
#define TRIGGER_PIN 12 // Pin connected to the ultrasonic sensor's trigger pin
#define ECHO_PIN 13    // Pin connected to the ultrasonic sensor's echo pin
#define LED 35   
//#define buzz 4
#define dht_pin 15
#define dht_Type DHT22
DHT dht(dht_pin, dht_Type );

void setup() {
Serial.begin(115200);
dht.begin() ;
pinMode(TRIGGER_PIN, OUTPUT); // Set trigger pin as output
pinMode(ECHO_PIN, INPUT);     // Set echo pin as input
//pinMode(buzz, OUTPUT);
pinMode(LED, OUTPUT);
}
void loop()
{
 float temperature= dht.readTemperature();

Serial.print("Temp:  "  );
Serial.print(temperature);
Serial.println("°C");

float Humidity= dht.readHumidity();


Serial.print("Hum:  "  );
Serial.print(Humidity);
Serial.println("%");


long duration, distance; // Variables to hold the pulse duration and calculated distance

  // Trigger ultrasonic sensor
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);

  // Measure the pulse duration from the echo pin
  duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate distance in centimeters (speed of sound is ~0.0343 cm/microsecond)
  distance = duration * 0.0343 / 2;

  // Print distance to serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

if(distance<=20){
  digitalWrite(LED, HIGH);
   // tone(buzz, 500,1000);
}
else{
  digitalWrite(LED, LOW);
}
delay(500); // Wait for stability
}