#include <DHT.h>
#define DHTPIN 5          // Pin connected to the DHT sensor
#define DHTTYPE DHT22     // DHT 11 or DHT22
#define trigPin 3    // Pin connected to the trigger pin of the ultrasonic sensor
#define echoPin 2   // Pin connected to the echo pin of the ultrasonic sensor
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
   pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
   Serial.println("write 1 for temperature and humidty measurement");
       Serial.println("write 2 for distance measurement");
}

void loop() {
  
       
  // Wait for input from the serial monitor
  while (Serial.available() == 0 ) {
    // Do nothing until input is received
  }
   
  
  int input = Serial.parseInt(); // Read the input integer from the serial monitorr
    if(input==1){
    

  float temperature = dht.readTemperature();  // Read temperature value
  float humidity = dht.readHumidity();        // Read humidity value


  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Print temperature and humidity values to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print("°C, Humidity: ");
  Serial.print(humidity);
  Serial.println("%");
      delay(2000);  // Wait 2 seconds between measurements
    } else if(input==2){
 // Send a pulse to the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the duration of the pulse from the echo pin
  long duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  float distance = duration * 0.034 / 2;

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

  // Wait for a short time before taking another measurement
  delay(1000);
    }

  // Wait a short time before taking another input
  delay(1000);
}