#include <DHT.h>
#include <NewPing.h>

#define DHTPIN 4         // Pin where the DHT sensor is connected
#define DHTTYPE DHT22    // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);

#define TRIG_PIN 5       // Ultrasonic sensor trigger pin
#define ECHO_PIN 18      // Ultrasonic sensor echo pin
NewPing sonar(TRIG_PIN, ECHO_PIN);

#define RED_LED_PIN 15   // Red LED pin
#define GREEN_LED_PIN 2  // Green LED pin

void setup() {
  Serial.begin(115200);
  dht.begin();
  
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);

  digitalWrite(RED_LED_PIN, LOW);   // Turn off both LEDs at the start
  digitalWrite(GREEN_LED_PIN, LOW);
}

void loop() {
  // Get distance from the ultrasonic sensor
  unsigned int distance = sonar.ping_cm();

  // Get temperature from DHT sensor
  float temperature = dht.readTemperature();
  
  // Check if the readings are valid
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Print values to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // If distance is less than 100 cm and temperature is above 50°C
  if (distance < 100 && temperature > 50) {
    digitalWrite(RED_LED_PIN, HIGH);    // Turn on red LED
    digitalWrite(GREEN_LED_PIN, LOW);   // Turn off green LED
    Serial.println("Red LED ON");
  } else {
    digitalWrite(RED_LED_PIN, LOW);     // Turn off red LED
    digitalWrite(GREEN_LED_PIN, HIGH);  // Turn on green LED
    Serial.println("Green LED ON");
  }

  delay(1000);  // Wait for a second before the next reading
}