/*
 * This ESP8266 NodeMCU code was developed by newbiely.com
 *
 * This ESP8266 NodeMCU code is made available for public use without any restriction
 *
 * For comprehensive instructions and wiring diagrams, please visit:
 * https://newbiely.com/tutorials/esp8266/esp8266-temperature-sensor-lcd
 */

#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>

#define SENSOR_PIN 14 // The ESP8266 pin connected to DS18B20 sensor's DQ pin

OneWire oneWire(SENSOR_PIN);
DallasTemperature DS18B20(&oneWire);
LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows

float temperature_C; // temperature in Celsius
float temperature_F; // temperature in Fahrenheit

void setup() {
  DS18B20.begin();    // initialize the sensor
  lcd.init();         // Initialize the LCD I2C display
  lcd.backlight();    // open the backlight
}

void loop() {
  DS18B20.requestTemperatures();       // send the command to get temperatures
  temperature_C = DS18B20.getTempCByIndex(0);  // read temperature in Celsius
  temperature_F = temperature_C * 9 / 5 + 32; // convert Celsius to Fahrenheit

  lcd.clear();
  lcd.setCursor(0, 0);  // display position
  lcd.print(temperature_C);     // display the temperature in Celsius
  lcd.print((char)223); // display ° character
  lcd.print("C");
  lcd.setCursor(0, 1);  // display position
  lcd.print(temperature_F);     // display the temperature in Fahrenheit
  lcd.print((char)223); // display ° character
  lcd.print("F");

  delay(500);
}