#include <DHT.h>

// Define pin numbers
#define MOTOR_PIN 3           // PWM pin connected to motor driver
#define LED_PIN 5             // Pin connected to LED
#define BUTTON_PIN 7          // Pin connected to the button
#define TRIG_PIN 8            // Trig pin of the ultrasonic sensor
#define ECHO_PIN 9            // Echo pin of the ultrasonic sensor
#define DHT_PIN 10            // Pin connected to the DHT sensor
#define DHTTYPE DHT22         // DHT sensor type (DHT11 or DHT22)

#define RUN_TIME 5000         // Run time in milliseconds (5 seconds)
#define DISTANCE_THRESHOLD 10 // Distance threshold in cm
#define TEMP_THRESHOLD 30     // Temperature threshold in Celsius

DHT dht(DHT_PIN, DHTTYPE);

void setup() {
  // Set pin modes
  pinMode(MOTOR_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // Initialize the motor and LED to be off
  digitalWrite(MOTOR_PIN, LOW);
  digitalWrite(LED_PIN, LOW);

  // Initialize the DHT sensor
  dht.begin();

  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read button state
  int buttonState = digitalRead(BUTTON_PIN);

  // Read temperature
  float temperature = dht.readTemperature();

  // Read distance
  long duration = getUltrasonicDistance();
  int distance = duration * 0.034 / 2;

  // Check button state and sensor thresholds
  if (buttonState == HIGH || (distance < DISTANCE_THRESHOLD && temperature < TEMP_THRESHOLD)) {
    // Turn on the motor and LED
    digitalWrite(MOTOR_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);

    // Wait for the specified run time
    delay(RUN_TIME);

    // Turn off the motor and LED
    digitalWrite(MOTOR_PIN, LOW);
    digitalWrite(LED_PIN, LOW);

    // Wait for the specified run time before restarting the loop
    delay(RUN_TIME);
  } else {
    // Ensure the motor and LED are off
    digitalWrite(MOTOR_PIN, LOW);
    digitalWrite(LED_PIN, LOW);
  }

  // Print sensor values for debugging
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C, Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
}

long getUltrasonicDistance() {
  // Send a 10us pulse to trigger the sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Read the echo time in microseconds
  long duration = pulseIn(ECHO_PIN, HIGH);

  return duration;
}