Building a Digital Thermometer Using Arduino

In this project, we will combine two components: the 1602 LCD Display and the DHT11 temperature and humidity sensor to create a functional digital thermometer.

To get started, make sure to read the tutorial on the DHT11 sensor that explains how to read data from the sensor. Additionally, read the 1602 LCD tutorial that covers writing to the display.

Once you are familiar with both components, you can proceed by integrating them into the same Arduino project.

Here is an example circuit setup:

[Insert Circuit Diagram]

Now let’s take a look at the code side of the project. Begin by including the necessary libraries DHT and LiquidCrystal. Then, initialize the two components in the setup() function.

In the loop() function, we check for data from the sensor every 2 seconds and display it on the LCD:

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

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

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

void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();

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

Now you can observe the project in action:

[Insert Project Photos]

Tags: Arduino, Digital Thermometer, LCD Display, DHT11, Temperature Sensor, Humidity Sensor