AetherSense-

Arduino UNO DHT11: Temperature & Humidity Monitoring with LED Control

This repo contains a simple Arduino sketch that reads temperature and humidity from a DHT11 sensor, prints the values to the Serial Monitor, and turns an LED ON when the temperature crosses a threshold (default 30°C).

Hardware

• Arduino UNO
• DHT11 sensor/module
• LED + 220Ω–1kΩ resistor
• Jumper wires

Wiring

DHT11       Arduino UNO
-----       -----------
VCC   --->  5V
GND   --->  GND
DATA  --->  D7    (use 10k pull‑up to 5V if your module doesn't include one)

LED         Arduino UNO
---         -----------
Anode --->  D12 (through a resistor)
Cathode ->  GND

Software

• Arduino IDE 1.8.x or 2.x
• Install libraries via Sketch ▸ Include Library ▸ Manage Libraries...
  • DHT sensor library by Adafruit
  • Adafruit Unified Sensor

Usage

1. Open src/DHT11_LED_Control.ino in Arduino IDE.
2. Select Tools ▸ Board ▸ Arduino AVR Boards ▸ Arduino Uno.
3. Select the correct Port.
4. Upload the sketch.
5. Open Serial Monitor (9600 baud) to see:

   TEMPERATURE: 28.5 °C  |  HUMIDITY: 62.0 %
   

6. The LED on D12 turns ON when temperature >= 30°C.

Customize

• Change the temperature threshold in the code:

  const float TEMP_THRESHOLD_C = 30.0;

• Adjust the sampling interval by editing the delay(5000); line (milliseconds).

Repo Structure

arduino-dht11-led-monitor/
├─ src/
│  └─ DHT11_LED_Control.ino
├─ .gitignore
├─ LICENSE
└─ README.md

License

MIT