Arduino Mega 2560 + DHT11 Sensor Module

🧠 Overview
The Arduino Mega 2560 is a microcontroller board based on the ATmega2560.
The DHT11 module is a digital temperature and humidity sensor.
Together, they are used for environment monitoring projects (temperature + humidity display/logging).
🔍 Arduino Mega 2560 Key Features
Microcontroller: ATmega2560
Operating Voltage: 5 V
Digital I/O Pins: 54 (15 PWM)
Analog Inputs: 16
Clock Speed: 16 MHz
Flash Memory: 256 KB
Best For: Large projects requiring many pins
🌡️ DHT11 Sensor Key Features
Temperature Range: 0 °C to 50 °C
Humidity Range: 20% to 90% RH
Accuracy:
• Temperature: ±2 °C
• Humidity: ±5% RH
Output: Digital (single-wire protocol)
Operating Voltage: 3.3 V – 5 V
Sampling Rate: 1 reading per second
⚙️ Pin Connections
DHT11 Module → Arduino Mega 2560
VCC → 5V
GND → GND
DATA → Digital Pin (e.g., D2)
📌 Note:
If using a bare DHT11 (not module), add a 10 kΩ pull-up resistor between VCC and DATA.
🧠 How It Works
DHT11 senses temperature (thermistor) and humidity (capacitive sensor).
Sensor converts readings into digital data.
Arduino Mega reads data via a single digital pin.
Data is processed and displayed on Serial Monitor / LCD / IoT dashboard.
📋 Basic Working Logic
Initialize DHT11 library in Arduino code.
Read temperature & humidity values periodically.
Print or display values.
🧪 Typical Applications
Weather monitoring systems
Smart home automation (HVAC control)
Greenhouse monitoring
IoT environmental logging
Educational projects
⚠️ Important Notes
Slow Sensor: Updates only once per second.
Low Accuracy: Not suitable for precise measurements.
Better Alternatives: DHT22, SHT31, SHT40 for higher accuracy.
Stable Power: Use clean 5 V supply for consistent readings.
🛠 Summary
Arduino Mega 2560: Controller with many I/O pins
DHT11: Basic temperature & humidity sensor
Interface: Single digital pin communication
Use Case: Simple environmental monitoring projects