DHT11 Temperature and humidity sensor

The DHT11 is a basic, ultra-low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and outputs a digital signal on the data pin. It’s simple to use but requires careful timing to grab data. It’s perfect for DIY projects, weather stations, and other applications where accurate and reliable temperature and humidity readings are needed.

Key Features:

• Temperature Range: 0-50°C with ±2°C accuracy
• Humidity Range: 20-80% RH with ±5% RH accuracy
• Low Power Consumption: Efficient for battery-operated applications
• Single Wire Digital Interface: Easy to interface with microcontrollers
• Pre-calibrated: No need for additional calibration
• Compact Size: Suitable for compact projects and devices

Technical Specifications:

• Temperature Range: 0-50°C (32-122°F)
• Humidity Range: 20-80% RH
• Temperature Accuracy: ±2°C
• Humidity Accuracy: ±5% RH
• Operating Voltage: 3.3V to 5.5V
• Max Current: 2.5mA
• Output: Digital signal via 1-wire protocol
• Dimensions: 15.5mm x 12mm x 5.5mm

Applications:

• Weather Stations: Monitor and log temperature and humidity levels.
• Home Automation: Control HVAC systems based on environmental conditions.
• Greenhouses: Maintain optimal growing conditions for plants.
• DIY Projects: Perfect for hobbyists building custom sensors and gadgets.
• Data Loggers: Record environmental data over time for analysis.
• Educational Projects: Teach students about sensors and data acquisition.

Usage:

1. Wiring: Connect the VCC pin to 3.3V or 5V, GND to ground, and the DATA pin to a digital input on your microcontroller.
2. Library Integration: Use libraries available for platforms like Arduino or Raspberry Pi to simplify reading data from the sensor.
3. Coding: Write code to initialize the sensor and read temperature and humidity data.
4. Data Processing: Process and use the sensor data in your application as needed, such as displaying it on an LCD or sending it to a web server.

Caution:

• Power Supply: Ensure the sensor is supplied with the correct voltage to avoid damage.
• Environmental Conditions: Keep the sensor in a dust-free, non-condensing environment for accurate readings.
• Wiring Length: Minimize the length of wiring between the sensor and the microcontroller to maintain signal integrity.

Datasheet:
For detailed technical specifications, refer to the DHT11 Datasheet.