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

#define ONE_WIRE_BUS 8   // Pin, kde je připojen DS18B20

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

DeviceAddress sensorAddress;
bool sensorFound = false;

void printAddress(DeviceAddress deviceAddress) {
  for (uint8_t i = 0; i < 8; i++) {
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}

void setup() {
  pinMode(8, INPUT_PULLUP);
  Serial.begin(115200);
  delay(2000);

  Serial.println("Hledám DS18B20...");

  sensors.begin();

  if (sensors.getDeviceCount() == 0) {
    Serial.println("Žádné čidlo nenalezeno!");
    return;
  }

  if (sensors.getAddress(sensorAddress, 0)) {
    sensorFound = true;
    Serial.print("Čidlo nalezeno, adresa: ");
    printAddress(sensorAddress);
    Serial.println();

    sensors.setResolution(sensorAddress, 12); // 9–12 bitů
  } else {
    Serial.println("Nepodařilo se získat adresu čidla.");
  }
}

void loop() {

  if (!sensorFound) {
    delay(2000);
    return;
  }

  sensors.requestTemperatures();

  float temperature = sensors.getTempC(sensorAddress);

  if (temperature == DEVICE_DISCONNECTED_C) {
    Serial.println("Čidlo odpojeno!");
  } else {
    Serial.print("Teplota: ");
    Serial.print(temperature);
    Serial.println(" °C");
  }

  delay(2000);
}