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#include <WiFi.h> 
#include "time.h"
#include <Adafruit_SSD1306.h>  // 0.9 Zoll OLED

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET); 

const char* ntpServer = "pool.ntp.org";
const long  gmtOffset_sec = 3600;
const int   daylightOffset_sec = 3600;


char ssid[] = "***";    // Your network SSID (name)
char pass[] = "***";  // Your network password (if any)

static float  TempS = 7.8;
static float  TempG = 15.3;
static short  Lux = 59;

void setup() {
  Serial.begin(115200);
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) 
  {
      delay(500);
      Serial.print(".");
  } 
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.print("Local IP address : ");
  Serial.println(WiFi.localIP());

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE); 
  display.setCursor(0,0);
  display.println("Modul startet...");
  display.println("Locale IP addresse: "); 
  display.println(WiFi.localIP());
 
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();
  display.display();
  delay(5000);  
  
}

void loop() 
{
    Serial.print("Temperatur Schlafhaus: ");  
    Serial.printf("%3.1f \n",TempS);
    Serial.print("Temperatur Vorraum   : ");  
    Serial.printf("%3.1f \n",TempG);
    Serial.print("Helligkeit (LUX)     : ");  
    Serial.println(Lux);  
    Serial.println("");  

    display.clearDisplay();
    display.setCursor(0,0);
    display.setTextSize(1);
    printLocalTime();

    display.setTextSize(2);
    display.setCursor(0,10);
    display.print("SH :");  
    char anzeige[10];
    dtostrf(TempS, 4, 1, anzeige);
    display.println(anzeige);  
    
    display.print("GH :");  
    dtostrf(TempG, 4, 1, anzeige);
    display.println(anzeige);  
    display.print("LUX:");  
    display.println(Lux);  

    display.display();
    delay(1000);  

}  //void loop


void printLocalTime()
{
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time");
    return;
  }
  Serial.println(&timeinfo, "%d.%m.%Y %H:%M:%S");
  display.println(&timeinfo, "%d.%m.%Y %H:%M:%S");
}