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

const int ONE_WIRE_BUS = 0; // DS18B20 Data pin connected to PB0
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

const int ledPin1 = 3; // Pin for first LED
const int ledPin2 = 4; // Pin for second LED
const int ledPin3 = 5; // Pin for third LED

SoftwareSerial mySerial(0, 1); // RX, TX (Use PB0 and PB1 for SoftwareSerial)

void setup() {
  sensors.begin();
  mySerial.begin(9600);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
}

void loop() {
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);
  delay(500);
  doprinting(temperatureC);
}

void doprinting(float temperatureC) {
  if(temperatureC <= 34) {
    digitalWrite(ledPin1, HIGH);
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW);
  } else if(temperatureC > 34 && temperatureC < 39) {
    digitalWrite(ledPin1, HIGH);
    digitalWrite(ledPin2, HIGH);
    digitalWrite(ledPin3, LOW);    
  } else if(temperatureC > 39) {
    digitalWrite(ledPin1, HIGH);
    digitalWrite(ledPin2, HIGH);
    digitalWrite(ledPin3, HIGH);     
  }
  mySerial.print("Temperature: ");
  mySerial.print(temperatureC);
  mySerial.println(" °C");
}