Skip to content

Arduino project: build a digital thermometer

New Course Coming Soon:

Get Really Good at Git

In this project I want to combine 2 components, the 1602 LCD Display

and the DHT11 temperature and humidity sensor

to create a digital thermometer we could actually use in the real world.

Before we start, read the DHT11 tutorial where we write a program that reads the data from the sensor:

and also read the 1602 LCD tutorial where I explain how to write to the display:

Once you do so, all you need to do from the circuits perspective is to add both circuits to the same Arduino based project:

Here it is in practice:

On the code side, we do a similar thing. We include both the DHT and the LiquidCrystal libraries first, then we initialize the 2 components.

We initialize them in setup() and in loop() we check every 2 seconds the data coming from the sensor, and we print it to the LCD display:

#include <LiquidCrystal.h>
#include <DHT.h>

DHT dht(2, DHT11);
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

void setup() {
  lcd.begin(16, 2);

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {

  lcd.setCursor(0, 0);
  lcd.print((String)"Temp: " + t + "C");
  lcd.setCursor(0, 1);
  lcd.print((String)"Humidity: " + h + "%");

Here is the project running:

Are you intimidated by Git? Can’t figure out merge vs rebase? Are you afraid of screwing up something any time you have to do something in Git? Do you rely on ChatGPT or random people’s answer on StackOverflow to fix your problems? Your coworkers are tired of explaining Git to you all the time? Git is something we all need to use, but few of us really master it. I created this course to improve your Git (and GitHub) knowledge at a radical level. A course that helps you feel less frustrated with Git. Launching Summer 2024. Join the waiting list!

Here is how can I help you: