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

// Data wire is conntec to the Arduino digital pin 4
#define ONE_WIRE_BUS 4
const int ledPin = 21;
const float thresholdTemp = 30.0;
// 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);

void setup(void)
{
  // Start serial communication for debugging purposes
  Serial.begin(9600);
  // Start up the library
  sensors.begin();
  pinMode(ledPin, OUTPUT);
}

void loop(void)
{ 
  // Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus
  sensors.requestTemperatures();
  float temperature= sensors.getTempCByIndex(0);
  
  Serial.print("Celsius temperature: ");
  // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
  Serial.print(temperature); 
  Serial.print(" - Fahrenheit temperature: ");
  Serial.println(sensors.getTempFByIndex(0));
   if (temperature > thresholdTemp)
   { 
     digitalWrite(21, !digitalRead(21));
     Serial.print("Alert: Temperature exceeds threshold! Temperature: ");
    

    // Convert the float temperature to a string
      String tempStr = String(temperature, 1); // 1 decimal place

    // Send the temperature as a string byte by byte
      for (int i = 0; i < tempStr.length(); i++) 
      {
      Serial.write(tempStr[i]);
      }
   }
   else
   {
        digitalWrite(ledPin, LOW);
   }
  delay(1000);
}