#include <U8g2lib.h>
//#include <OneWire.h>
#include <DallasTemperature.h>

// Connect DS18B20 to D4
#define ONE_WIRE_BUS 4
// Setup a OneWire instance to communicate with any OneWire devices.
OneWire oneWire(ONE_WIRE_BUS);
// Pass our OneWire reference to Dallas Temperature sensor.
DallasTemperature sensors(&oneWire);

// Initialize the display
U8G2_SSD1306_128X64_NONAME_F_SW_I2C
u8g2(U8G2_R0,/*clock=*/21,/*data*/22,U8X8_PIN_NONE);

 byte numDevices = 0;

// Initialization of sensor and serial communication.
void setup()
{
  Serial.begin(115200);
  sensors.begin();
  u8g2.begin();
  byte address[8];

  while (oneWire.search(address))
  {
    Serial.print("Bus index=");
    Serial.print(numDevices);
    Serial.print(";  Device address=");
    for(byte i = 0; i < 8; i++)
    {
      Serial.print(address[i], HEX);
      Serial.print(" ");
    }
    Serial.println();
    numDevices++;
  }
}

void loop()
{
  if (numDevices > 0)
  {
    sensors.requestTemperatures();

    for (byte i = 0; i < numDevices; i++)
    {
      float temperatureC = sensors.getTempCByIndex(i);
      char temperatureString[20]; // Adjust size if needed
      dtostrf(temperatureC, 6, 2, temperatureString);

      String displayString = "Temp: ";
      displayString += temperatureString;
      displayString += " C";

      // Clear the display and set font
      u8g2.clearBuffer();
      u8g2.setFont(u8g2_font_ncenB08_tr);

      // Draw the string on the display
      u8g2.drawStr(0, 24, displayString.c_str());
      u8g2.sendBuffer();

      // Serial output
      Serial.print("Bus index=");
      Serial.print(i);
      Serial.print(";  Temperature=");
      Serial.print(temperatureC);
      Serial.println("°C");
    }
  }

  delay(4000);
}



      //u8g2.clearBuffer();
      //u8g2.setFont(u8g2_font_7x14B_tr);
      //u8g2.drawStr(0,0,"");
      //u8g2.sendBuffer();