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Arduino - Temperature Sensor - LCD
Hardware Required
| 1 | × | Arduino UNO or Genuino UNO | |
| 1 | × | USB 2.0 cable type A/B | |
| 1 | × | LCD I2C | |
| 1 | × | Temperature Sensor DS18B20 | |
| 1 | × | 4.7 kΩ resistor | |
| 1 | × | Breadboard | |
| n | × | Jumper Wires |
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About Temperature Sensor and LCD
If you do not know about temperature sensor and LCD (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
Arduino Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-temperature-sensor-lcd
*/
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>
const int SENSOR_PIN = 13; // Arduino pin connected to DS18B20 sensor's DQ pin
OneWire oneWire(SENSOR_PIN); // setup a oneWire instance
DallasTemperature sensors(&oneWire); // pass oneWire to DallasTemperature library
LiquidCrystal_I2C lcd(0x3F, 16, 2); // I2C address 0x27, 16 column and 2 rows
float tempCelsius; // temperature in Celsius
float tempFahrenheit; // temperature in Fahrenheit
void setup()
{
sensors.begin(); // initialize the sensor
lcd.init(); // initialize the lcd
lcd.backlight(); // open the backlight
}
void loop()
{
sensors.requestTemperatures(); // send the command to get temperatures
tempCelsius = sensors.getTempCByIndex(0); // read temperature in Celsius
tempFahrenheit = tempCelsius * 9 / 5 + 32; // convert Celsius to Fahrenheit
lcd.clear();
lcd.setCursor(0, 0); // start to print at the first row
lcd.print(tempCelsius); // print the temperature in Celsius
lcd.print((char)223); // print ° character
lcd.print("C");
lcd.setCursor(0, 1); // start to print at the second row
lcd.print(tempFahrenheit); // print the temperature in Fahrenheit
lcd.print((char)223); // print ° character
lcd.print("F");
delay(500);
}
※ NOTE THAT:
The I2C address of LCD can vary according to the manufacturers. In the code, we used 0x27 that is specified by DIYables manufacturer
Quick Steps
- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
On Arduino IDE, Go to Tools Manage Libraries
- Search “OneWire”, then find the OneWire library by Paul Stoffregen
- Click Install button to install OneWire library.
- Search “Dallas”, then find the DallasTemperature library by Miles Burton.
- Click Install button to install DallasTemperature library.
- Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
- Click Install button to install LiquidCrystal_I2C library.
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to Arduino
- Put the sensor on hot and cold water, or grasp the sensor by your hand
- See the result in LCD
Image is developed using Fritzing. Click to enlarge image
If LCD displays nothing, see Troubleshooting on LCD I2C
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Video Tutorial
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Temperature Sensor and LCD on Commercial Products
The Best Arduino Starter Kit
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