wemos_d1_mini_02

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>

#include <Wire.h>
#include "HTU21D.h"

HTU21D myHTU21D(HTU21D_RES_RH12_TEMP14); //-- resolution HTU21D_RES_RH12_TEMP14 - RH: 12Bit, Temperature: 14Bit, by default

#ifndef STASSID
#define STASSID "***"
#define STAPSK  "***"
#endif

String sURL = "http://data.peezee.eu/index.php";
String sTemp = "";
String sHumidity = "";
String sBattery = "";

void setup()
{
  Serial.begin(115200);
  Serial.println();

  while (myHTU21D.begin() != true)
  {
    Serial.println(F("HTU21D, SHT21 sensor je vadny nebo nepripojeny")); //(F()) saves string to flash & keeps dynamic memory free
    delay(5000);
  }
  Serial.println(F("HTU21D, SHT21 sensor je aktivni"));

  WiFi.begin(STASSID, STAPSK);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected! IP address: ");
  Serial.println(WiFi.localIP());

}

void loop()
{

  sHumidity = String(myHTU21D.readHumidity()) + F(" (+-2%)");
  sTemp = String(myHTU21D.readTemperature()) + F(" (+-0.3C)");
  if   (myHTU21D.batteryStatus() == true) sBattery = F("OK.  Level > 2.25v");
  else                                    sBattery = F("Slabá. Level < 2.25v");

  Serial.print(F("MAC: ")); Serial.println(getMacAddress());

  Serial.print(F("Teplota: ")); Serial.println(sTemp);
  Serial.print(F("Vlhkost: ")); Serial.println(sHumidity);
  Serial.print(F("Baterie: ")); Serial.println(sBattery);
  Serial.println(F("--------- a nyni posleme data ----------------------------------------------------------"));

  if ((WiFi.status() == WL_CONNECTED)) {

    WiFiClient client;
    HTTPClient http;

    Serial.print("[HTTP] begin...");
    Serial.println(sURL);
    http.begin(client, sURL);
    http.addHeader("Content-Type", "text/plain");
    //Serial.print("[HTTP] POST...\n");
    int httpCode = http.POST("aaa");
    if (httpCode > 0) {
      Serial.printf("[HTTP] POST... code: %d\n", httpCode);
      if (httpCode == HTTP_CODE_OK) {
        String payload = http.getString();
        Serial.println("received payload:\n<<");
        Serial.println(payload);
        Serial.println(">>");
      }
    } else {
      Serial.printf("[HTTPS] POST... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }

    http.end();
  }

  Serial.println(F("--------- za 20 sec. znovu ----------------------------------------------------------"));

  delay(20000);

}
//---------------------------------------------------------------------------------------------------------------------------------
String getMacAddress()
{
  byte mac[6];
  WiFi.macAddress(mac);
  String cMac = "";
  for (int i = 0; i < 6; ++i)
  {
    cMac += String(mac[i],HEX);
    if(i < 5)
      cMac += "-";
  }
  cMac.toUpperCase();
  return cMac;
}