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 |
Please note: These are affiliate links. If you buy the components through these links, We may get a commission at no extra cost to you. We appreciate it.
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);
}
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
We are considering to make the video tutorials. If you think the video tutorials are essential, please subscribe to our YouTube channel to give us motivation for making the videos.
Temperature Sensor and LCD on Commercial Products
The Best Arduino Starter Kit
See Also
Follow Us