esp32_dht_1b.ino

/*
 esp32 WIFI-Client.
 dht11 sensor Use
 ver 0.9.2
 */
#include <WiFi.h>
#include <DHT.h>

#define DHTPIN 14     // what digital pin we're connected to
#define DHTTYPE DHT11   // DHT 11

DHT dht(DHTPIN, DHTTYPE);

const char* ssid = "";
const char* password = "";

const char* host = "api.thingspeak.com";
String mAPI_KEY="your-KEY";
uint32_t mTimer= 0;
uint32_t mTimerTmp=0;

//unsigned long mTimer= 0;
//
void setup()
{
    Serial.begin(115200);
    dht.begin();
    delay(10);

    // We start by connecting to a WiFi network

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

    WiFi.begin(ssid, password);

    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
}

int value = 0;
void proc_http(String sTemp , String sHum){
//  void proc_http(String sTemp ){
//Serial.print("connecting to ");
//Serial.println(host);  
      WiFiClient client;
      const int httpPort = 80;
      if (!client.connect(host, httpPort)) {
        Serial.println("connection failed");
        return;
      }
      String url = "/update?key="+ mAPI_KEY + "&field1="+ sTemp ;        
             url +="&field2="+ sHum;
      client.print(String("GET ") + url + " HTTP/1.1\r\n" +
        "Host: " + host + "\r\n" + 
        "Connection: close\r\n\r\n");
      delay(10); 
      unsigned long timeout = millis();
      while (client.available() == 0) {
        if (millis() - timeout > 5000) {
            Serial.println(">>> Client Timeout !");
            client.stop();
            return;
        }
      }     
      //int iSt=0;
      while(client.available()){
          String line = client.readStringUntil('\r');
//Serial.print(line);
      }   
    Serial.println();
    Serial.println("closing connection"); 
}


//
void loop()
{
  float fHum =0;
  float fTmp =0;
  if( millis() > mTimerTmp ){
    mTimerTmp= millis() +5000;
    float fHum = dht.readHumidity();
    float fTmp = dht.readTemperature();
    if (isnan(fHum ) || isnan(fTmp ) ) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }
    String sBuff="sTmp=" +String(fTmp )+" ,sHum=" +String(fHum )  ;
    //Serial.println("sTmp=" +String(fTmp ) );
    Serial.println(sBuff );   
  }
  if(millis() >mTimer ){
    mTimer =millis()  +( 30 * 1000 );
    // mTimerTmp = millis()+ 1000;
    proc_http(String(fTmp ) , String(fHum ) );
  }


}