Arduino-Based Temperature Monitoring System

Overview

This project uses an Arduino Uno and a DHT11 temperature and humidity sensor to monitor ambient temperature in real-time. The system displays temperature readings on the serial monitor and triggers an LED alert if the temperature exceeds a set threshold.

Features

• Reads temperature from DHT11 sensor.
• Displays temperature on Arduino serial monitor.
• Turns on onboard LED when temperature exceeds 30°C.
• Simple embedded C code using Arduino IDE.

Hardware Required

• Arduino Uno
• DHT11 Temperature and Humidity Sensor
• Jumper wires
• (Optional) Breadboard

Wiring

• DHT11:
  • VCC to 5V on Arduino
  • GND to GND on Arduino
  • Data pin to Digital Pin 2 on Arduino
• LED:
  • Use built-in LED on pin 13 (no extra wiring needed)

Usage

1. Open Arduino IDE and install the DHT sensor library by Adafruit (via Library Manager).
2. Upload temp_monitor.ino sketch to the Arduino board.
3. Open Serial Monitor at 9600 baud to view temperature readings.
4. Observe onboard LED turning on when temperature exceeds 30°C.

Learning Outcomes

• Interfacing sensors with Arduino.
• Embedded C programming and Arduino IDE basics.
• Working with GPIO pins and digital output.
• Real-time sensor data acquisition and simple alert system.