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 oity 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 k pull-up resistor between VCC and DATA.

How It Works

• DHT11 senses temperature (thermistor) and humidity (capacitive sensor).

• Sensor converts readings intng>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 actrong>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

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