// Import the necessary libraries
#include <DHT.h>
#include <Wire.h>

// Define the DHT11 sensor pin
#define DHTPIN 2

// Define the DHT11 sensor type
#define DHTTYPE DHT11

// Create a DHT object
DHT dht(DHTPIN, DHTTYPE);

// Define the MOSFET 2N7000 pin
#define MOSFETPIN 3

// Initialize the variables
float temperature;
int fanSpeed;

void setup() {
  // Initialize the serial port
  Serial.begin(9600);

  // Initialize the DHT11 sensor
  dht.begin();

  // Set the MOSFET 2N7000 to LOW
  digitalWrite(MOSFETPIN, LOW);
}

void loop() {
  // Read the temperature from the DHT11 sensor
  temperature = dht.readTemperature();

  // Calculate the fan speed
  fanSpeed = map(temperature, 20, 80, 0, 100);

  // Set the MOSFET 2N7000 to the corresponding fan speed
  digitalWrite(MOSFETPIN, fanSpeed);

  // Print the temperature and fan speed to the serial port
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" degrees Celsius");
  Serial.print(" Fan speed: ");
  Serial.print(fanSpeed);
  Serial.println("%");

  // Delay for 1 second
  delay(1000);
}