Arduino - DHT22 - LCD

We will learn how to program Arduino to read temperature and humidity from DHT22 module and display them on LCD I2C.

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×DHT22 module
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kits:

1×DIYables Sensor Kit (30 sensors/displays)
1×DIYables Sensor Kit (18 sensors/displays)
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About DHT22 and LCD

If you do not know about DHT22 sensor and LCD (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino DHT22 LCD Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Code - DHT22 Sensor - LCD I2C

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #include <LiquidCrystal_I2C.h> #include "dht22.h" #define DHT22_PIN 2 LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows DHT dht22(DHT22_PIN, DHT22); void setup() { dht22.begin(); // initialize the sensor lcd.init(); // initialize the lcd lcd.backlight(); // open the backlight } void loop() { delay(2000); // wait a few seconds between measurements float humi = dht22.readHumidity(); // read humidity float tempC = dht22.readTemperature(); // read temperature lcd.clear(); // check if any reads failed if (isnan(humi) || isnan(tempC)) { lcd.setCursor(0, 0); lcd.print("Failed"); } else { lcd.setCursor(0, 0); // start to print at the first row lcd.print("Temp: "); lcd.print(tempC); // print the temperature lcd.print((char)223); // print ° character lcd.print("C"); lcd.setCursor(0, 1); // start to print at the second row lcd.print("Humi: "); lcd.print(humi); // print the humidity lcd.print("%"); } }


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
  • Navigate to the Libraries icon on the left bar of the Arduino IDE.
  • Search “DHT”, then find the DHT sensor library by Adafruit
  • Click Install button to install the library.
Arduino DHT sensor library
  • You will be asked for intalling some other library dependencies
  • Click Install All button all library dependencies.
Arduino Adafruit Unified sensor library
  • Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
  • Click Install button to install LiquidCrystal_I2C library.
Arduino LiquidCrystal I2C library
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Make enviroment around sensor hotter or colder
  • See the result in LCD

If LCD displays nothing, see Troubleshooting on LCD I2C

Video Tutorial

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