ESP 32 TO DHT 11



  • Low Cost & Easy Integration: The DHT11 is an affordable sensor that easily interfaces with the ESP32, making it ideal for budget-friendly projects.

  • Wireless Connectivity: The ESP32 has built-in Wi-Fi and Bluetooth, allowing remote monitoring and data transmission.

  • Low Power Consumption: Suitable for battery-powered applications, the ESP32 efficiently manages power while collecting environmental data.

  • Digital Output: The DHT11 provides a digital signal, simplifying data processing without requiring complex analog conversions.

  • Versatile Applications: Used in smart homes, weather stations, and IoT-based automation systems.

    🔧 Components Overview:

    • ESP32:

      • A powerful microcontroller with Wi-Fi and Bluetooth built in.

      • Suitable for IoT applications due to its wireless capabilities and low power consumption.

      • Has multiple GPIO (General Purpose Input/Output) pins to connect sensors and other devices.

    • DHT11 Sensor:

      • Measures temperature (in °C) and humidity (in %).

      • Simple and low-cost sensor.

      • Communicates with the ESP32 using a single digital pin.

      • Accuracy:

        • Temperature: ±2°C

        • Humidity: ±5%


    🔌 How It Works:

    1. Connection:

      • The DHT11 sensor is connected to one of the ESP32's GPIO pins.

      • Power (3.3V or 5V), ground (GND), and data line are used.

    2. Data Reading:

      • ESP32 uses a library (like DHT.h in Arduino IDE) to communicate with the sensor.

      • It sends a start signal to the DHT11.

      • The sensor responds with temperature and humidity data in digital form.

    3. Processing:

      • ESP32 reads the data, processes it, and can display it (e.g., on a serial monitor, OLED screen, or via a web server).

    4. Optional:

      • Use Wi-Fi to send the data to the cloud or a smartphone app for remote monitoring.

    📦 Common Applications:

    • Home automation

    • Weather stations

    • Smart agriculture

    • Environmental monitoring

    • code :

    • #include <WiFi.h>
      #include <WebServer.h>
      #include "DHT.h"

      // Uncomment one of the lines below for whatever DHT sensor type you're using!
      //#define DHTTYPE DHT11   // DHT 11
      //#define DHTTYPE DHT21   // DHT 21 (AM2301)
      #define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

      /*Put your SSID & Password*/
      const char* ssid = "YourNetworkName";  // Enter SSID here
      const char* password = "YourPassword";  //Enter Password here

      WebServer server(80);

      // DHT Sensor
      uint8_t DHTPin = 4;
                     
      // Initialize DHT sensor.
      DHT dht(DHTPin, DHTTYPE);                

      float Temperature;
      float Humidity;
       
      void setup() {
        Serial.begin(115200);
        delay(100);
       
        pinMode(DHTPin, INPUT);

        dht.begin();              

        Serial.println("Connecting to ");
        Serial.println(ssid);

        //connect to your local wi-fi network
        WiFi.begin(ssid, password);

        //check wi-fi is connected to wi-fi network
        while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.print(".");
        }
        Serial.println("");
        Serial.println("WiFi connected..!");
        Serial.print("Got IP: ");  Serial.println(WiFi.localIP());

        server.on("/", handle_OnConnect);
        server.onNotFound(handle_NotFound);

        server.begin();
        Serial.println("HTTP server started");

      }
      void loop() {
       
        server.handleClient();
       
      }

      void handle_OnConnect() {

       Temperature = dht.readTemperature(); // Gets the values of the temperature
        Humidity = dht.readHumidity(); // Gets the values of the humidity
        server.send(200, "text/html", SendHTML(Temperature,Humidity));
      }

      void handle_NotFound(){
        server.send(404, "text/plain", "Not found");
      }

      String SendHTML(float Temperaturestat,float Humiditystat){
        String ptr = "<!DOCTYPE html> <html>\n";
        ptr +="<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\">\n";
        ptr +="<title>ESP32 Weather Report</title>\n";
        ptr +="<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}\n";
        ptr +="body{margin-top: 50px;} h1 {color: #444444;margin: 50px auto 30px;}\n";
        ptr +="p {font-size: 24px;color: #444444;margin-bottom: 10px;}\n";
        ptr +="</style>\n";
        ptr +="</head>\n";
        ptr +="<body>\n";
        ptr +="<div id=\"webpage\">\n";
        ptr +="<h1>ESP32 Weather Report</h1>\n";
       
        ptr +="<p>Temperature: ";
        ptr +=(int)Temperaturestat;
        ptr +="°C</p>";
        ptr +="<p>Humidity: ";
        ptr +=(int)Humiditystat;
        ptr +="%</p>";
       
        ptr +="</div>\n";
        ptr +="</body>\n";
        ptr +="</html>\n";
        return ptr;
      }

  •  our chip data's temperature = 26.60 c 

  • compare to Pune weather= 26.24 c

  • from local server humidity = 84.80 c

  • from our server humidity = 81. 32 c

    •  

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