Room Temperature Monitor

Published: January 15, 2026

A simple room temperature and humidity monitor that uses the DHT11 sensor to measure environmental conditions and display live readings on an LCD1602 screen.

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📸 Preview

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⚙️ How It Works:

• The DHT11 sensor measures both temperature (in °C) and humidity (%).
• The Arduino reads the sensor data every second.
• The LCD1602 display shows the values across two rows.
• Row 1: Temp: XX°C, Row 2: Humidity: XX%
• It provides a live view of your room's climate.

📦 Components Used:

Component	Purpose
Arduino UNO	Main controller
DHT11 Sensor	Measures temperature and humidity
LCD1602 (16-pin)	Displays live readings
10k Potentiometer	Adjusts LCD contrast
Breadboard + jumper wires	Connections

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🔌 Wiring Instructions

🟦 DHT11 Sensor

DHT11 Pin	Connect to Arduino
VCC	5V
DATA	D10
GND	GND

🟩 LCD1602 (16-pin)

LCD Pin	Label	Connect to Arduino
1	GND	GND
2	VCC	5V
3	VO	Middle pin of 10k pot
4	RS	D7
5	RW	GND
6	E	D6
11	D4	D5
12	D5	D4
13	D6	D3
14	D7	D2
15	A	5V
16	K	GND

Potentiometer: One side → GND, Other side → 5V, Middle pin → LCD pin 3 (VO)

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🧾 Arduino Code

    #include 
    #include "dht_nonblocking.h"

    #define DHT_SENSOR_TYPE DHT_TYPE_11
    static const int DHT_SENSOR_PIN = 10;

    DHT_nonblocking dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);

    // LCD: RS, E, D4, D5, D6, D7
    LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

    void setup() {
    lcd.begin(16, 2);
    lcd.setCursor(0, 0);
    lcd.print("Temp & Humidity");
    delay(2000);
    lcd.clear();
    }

    void loop() {
    float temperature;
    float humidity;

    if (dht_sensor.measure(&temperature, &humidity)) {
        lcd.setCursor(0, 0);
        lcd.print("Temp: ");
        lcd.print(temperature);
        lcd.print((char)223);
        lcd.print("C   ");

        lcd.setCursor(0, 1);
        lcd.print("Humidity: ");
        lcd.print(humidity);
        lcd.print("%   ");
    }

    delay(1000);
    }
        

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📦 Installing the Required Libraries

1️⃣ LiquidCrystal

This library comes pre-installed with Arduino IDE. No action needed.

2️⃣ DHT_nonblocking Library

1. Open Arduino IDE
2. Go to Sketch → Include Library → Manage Libraries…
3. Search for DHT sensor library (non-blocking)
4. Click Install

ZIP Install: Use Sketch → Include Library → Add .ZIP Library… if you downloaded the file manually.

🚀 Uploading the Code

• Open Arduino IDE
• Paste the code
• Select your Arduino UNO board and port
• Click Upload ↑

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