ESP32 with a DHT11 sensor module:

Hardware Setup:

1. Gather the necessary components:
   • ESP32 development board
   • DHT11 sensor module
   • Jumper wires
   • Breadboard (optional)
   • Power supply (3.3V or 5V)
2. Connect the DHT11 sensor to the ESP32:
   • Connect the VCC pin of the sensor to the 3.3V or 5V output of the ESP32.
   • Connect the GND pin of the sensor to the ground pin of the ESP32.
   • Connect the data pin of the sensor (usually labeled “D”) to a digital input pin on the ESP32 (e.g., GPIO13).

Software Setup:

1. Install the Arduino IDE: Download and install the Arduino IDE from https://support.arduino.cc/hc/en-us/articles/360019833020-Download-and-install-Arduino-IDE.  
2. Install the ESP32 board support package: Open the Arduino IDE, go to File > Preferences, and add the following URL to the Additional Boards Manager URLs field: https://dl.espressif.com/package/esp32/index.json. Then, go to Tools > Board > Boards Manager and install the “ESP32” board.  
3. Install the DHT11 library: Search for “DHT11 from adafruit” in the Library Manager and install it.

Code:

C++

#include <DHT.h>

#define DHTTYPE DHT11

#define DHTPIN 18 //change pin as per your board 

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  dht.begin();
}

void loop() {
  // Wait for sensor reading
  delay(1000);

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

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

  // Print the values
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("    %  Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
}

Explanation:

• The code includes the necessary DHT11 library.
• The DHTTYPE and DHTPIN constants define the DHT11 sensor type and the GPIO pin connected to it.
• In the setup() function, the DHT11 sensor is initialized.
• In the loop() function, the readHumidity() and readTemperature() functions are used to read the humidity and temperature values from the sensor.
• The isnan() function is used to check for errors in the sensor readings.
• The values are then printed to the serial monitor.

Uploading the Code:

1. Connect the ESP32 to your computer.
2. Select the correct board and port in the Arduino IDE.
3. Compile and upload the code to the ESP32.

Testing:

1. Open the serial monitor in the Arduino IDE.
2. Observe the humidity and temperature values being printed.

Additional Notes:

• The DHT11 sensor has a relatively slow reading rate. If you need faster readings, consider using a DHT22 or DHT21 sensor.
• You can customize the code to perform different actions based on the sensor readings (e.g., triggering alarms, controlling devices).
• Consider using a library or framework like ThingSpeak or Blynk to visualize and analyze the sensor data.

By following these steps, you can effectively use an ESP32 to measure temperature and humidity using a DHT11 sensor.