Write a program to interface LCD and DHT11, displaying the value read from sensor DHT on LCD.
Last Updated : 16 Jul 2025
Solution:
#include "DHT.h"
#include <LiquidCrystal.h>
#define DHTPIN 2 // Pin connected to the DHT11 sensor
#define DHTTYPE DHT11 // Define the type of DHT sensor (DHT11)
const int rs = 11; // RS pin for LCD
const int en = 10; // EN pin for LCD
const int d4 = 9; // Data pin 4 for LCD
const int d5 = 8; // Data pin 5 for LCD
const int d6 = 7; // Data pin 6 for LCD
const int d7 = 6; // Data pin 7 for LCD
LiquidCrystal lcd(rs, en, d4, d5, d6, d7); // Create an LCD object
DHT dht(DHTPIN, DHTTYPE); // Create a DHT object
void setup(){
dht.begin(); // Initialize the DHT sensor
lcd.begin(16, 2); // Initialize the LCD with 16 columns and 2 rows
lcd.print("Temp: "); // Print a label on the LCD
}
void loop(){
float temp = dht.readTemperature(); // Read the temperature in Celsius
lcd.setCursor(6, 0); // Set cursor to column 6, row 0 (right after "Temp: ")
lcd.print(temp); // Print the temperature value
lcd.print(" C"); // Print the temperature unit
delay(2000); // Wait for 2 seconds before taking the next reading
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