======== ESP32: Mesure de temperature ======== ==== Liens Web ==== [[https://randomnerdtutorials.com/esp32-dht11-dht22-temperature-humidity-sensor-arduino-ide/| ESP32 : DHT11/22]] [[https://randomnerdtutorials.com/esp32-dht11-dht22-temperature-humidity-web-server-arduino-ide/|ESP32 : ServeurWeb1 DHT11/22]] [[https://microcontrollerslab.com/esp32-dht11-dht22-web-server/|ESP32 : ServeurWeb2 DHT11/22]] [[https://projetsdiy.fr/esp8266-dht22-mqtt-projet-objet-connecte/|ESP32 : Objet connecté DGT11/22]] [[https://thingsboard.io/docs/samples/esp32/gpio-control-pico-kit-dht22-sensor/|ESP32 PicoKit : DHT22]] [[https://github.com/bertmelis/esp32DHT|ESP32 : Librairie DHT22]] [[https://lastminuteengineers.com/dht11-dht22-arduino-tutorial/|DHT11/22]] [[https://roboindia.com/tutorials/DHT-sensor-arduino/|ARduino : DHT11/22]] ==== Test en réel sur carte ESP32 ==== === Matériel === **ESP32 TTGO LORA 32 V2.0** [[https://github.com/LilyGO/TTGO-LORA32|Caracteristiques ESP32 TTGO LORA 32 V2.0]] {{ :start:arduino:esp32:htb1v_abbtni8kjjsszbq6z4kfxah.resized.jpg?direct&400 |}} ** DHT 22 ** [[https://www.didel.com/DHT22.pdf|Caractéristiques DHT22 PDF FR]] {{ :start:arduino:esp32:dht22-pinout-800x800.jpg?direct&300 |}} {{ :start:arduino:esp32:capture_du_2021-03-16_12-38-57.png?direct&600 |}} === Branchement === ESP32 Lora32 V2 + DHT22 {{ :start:arduino:esp32:capture_du_2021-03-16_12-21-43.jpg?direct&400 |}} === Librairies à installer=== ** DHT ** [[https://github.com/adafruit/DHT-sensor-library| DHT-sensor-Library]] **ESPAsyncWebServer** [[https://github.com/me-no-dev/ESPAsyncWebServer|ESPAsyncWebServer.zip]] **AsyncTCP** [[https://github.com/me-no-dev/AsyncTCP|AsyncTCP.zip]] **Adafruit_Sensor** [[https://github.com/adafruit/Adafruit_Sensor|Adafruit_Sensor.zip]] === Programmes ===




/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com  
*********/

// Import required libraries
#include "WiFi.h"
#include "ESPAsyncWebServer.h"
#include 
#include 

// Replace with your network credentials
const char* ssid = "xxxxxxxxxxxx";
const char* password = "xxxxxxxxxxxxxx";

#define DHTPIN 13    // Digital pin connected to the DHT sensor

// Uncomment the type of sensor in use:
//#define DHTTYPE    DHT11     // DHT 11
#define DHTTYPE    DHT22     // DHT 22 (AM2302)
//#define DHTTYPE    DHT21     // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

String readDHTTemperature() {
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  //float t = dht.readTemperature(true);
  // Check if any reads failed and exit early (to try again).
  if (isnan(t)) {    
    Serial.println("Failed to read from DHT sensor!");
    return "--";
  }
  else {
    Serial.println(t);
    return String(t);
  }
}

String readDHTHumidity() {
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  if (isnan(h)) {
    Serial.println("Failed to read from DHT sensor!");
    return "--";
  }
  else {
    Serial.println(h);
    return String(h);
  }
}

const char index_html[] PROGMEM = R"rawliteral(


  
  
  


  ESP32 Serveur DHT 22
  
     
    Temperature 
    %TEMPERATURE%
    ^°C
  
  
     
    Humidite
    %HUMIDITY%
    ^%
  


)rawliteral";

// Replaces placeholder with DHT values
String processor(const String& var){
  //Serial.println(var);
  if(var == "TEMPERATURE"){
    return readDHTTemperature();
  }
  else if(var == "HUMIDITY"){
    return readDHTHumidity();
  }
  return String();
}

void setup(){
  // Serial port for debugging purposes
  Serial.begin(115200);

  dht.begin();
  
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }

  // Print ESP32 Local IP Address
  Serial.println(WiFi.localIP());

  // Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/html", index_html, processor);
  });
  server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", readDHTTemperature().c_str());
  });
  server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", readDHTHumidity().c_str());
  });

  // Start server
  server.begin();
}
 
void loop(){
  
}

=== Ecran serveur web === {{ :start:arduino:esp32:capture_du_2021-03-16_12-45-05.png?direct&600 |}}