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

#define ONE_WIRE_BUS 7
#define RED_LED   9
#define GREEN_LED 10
#define BLUE_LED  8

const float TEMP_LOWER = 20.0;
const float TEMP_UPPER = 28.0;

// LCD: RS, E, D4, D5, D6, D7
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(9600);
  sensors.begin();
  lcd.begin(16, 2);
  lcd.print("Thermometer");
  lcd.setCursor(0, 1);
  lcd.print("Ready...");

  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
  digitalWrite(RED_LED, LOW);
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(BLUE_LED, LOW);

  delay(2000);
}

void loop() {
  sensors.requestTemperatures();
  float temp = sensors.getTempCByIndex(0);

  // Гасим все
  digitalWrite(RED_LED, LOW);
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(BLUE_LED, LOW);

  if (temp < TEMP_LOWER) {
    digitalWrite(BLUE_LED, HIGH);
  } else if (temp > TEMP_UPPER) {
    digitalWrite(RED_LED, HIGH);
  } else {
    digitalWrite(GREEN_LED, HIGH);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  if (temp == DEVICE_DISCONNECTED_C) {
    lcd.print("ERROR");
  } else {
    lcd.print(temp);
    lcd.print((char)223);
    lcd.print("C");
  }

  lcd.setCursor(0, 1);
  lcd.print(TEMP_LOWER);
  lcd.print("-");
  lcd.print(TEMP_UPPER);
  lcd.print((char)223);
  lcd.print("C");

  delay(1000);
}