DHT11 Temperature and Relative Humidity Sensor Module for Arduino

DHT11 Temperature and Relative Humidity Sensor Module is a widely used, low-cost digital sensor designed for environmental monitoring and IoT applications. Featuring a pre-calibrated digital signal output combined with an NTC thermistor and a resistive-type humidity sensing component, it measures ambient air temperature and relative humidity with high reliability. Mounted on a convenient breakout PCB with a pull-up resistor and indicator LED, it plugs directly into Arduino, ESP32, and Raspberry Pi boards, making it ideal for weather stations, home automation, and greenhouse climate tracking.

Features

• Calibrated digital signal output ensuring accurate temperature and relative humidity readings
• Integrated resistive humidity element and NTC temperature measuring core
• Onboard breakout PCB design with pre-soldered pull-up resistor and power indicator LED
• 3-pin or 4-pin interface options (VCC, Data, GND) for easy breadboard and jumper wire connection
• Low power consumption suitable for battery-operated IoT sensor nodes and data loggers
• Excellent long-term stability and fast response time to ambient atmospheric changes
• Fully compatible with standard open-source libraries (DHT.h, Adafruit_Sensor)
• Cost-effective environmental sensor for educational and prototyping use

Applications

• Weather stations and indoor/outdoor atmospheric monitoring setups
• Smart home climate control, HVAC systems, and automated room humidifiers
• Greenhouse agricultural monitoring, mushroom farming, and incubator climate tracking
• Server room temperature and humidity warning systems
• Polytechnic diploma, university engineering thesis, and Arduino/ESP32 IoT environmental projects

Important Notes:

• Sampling Interval: Do not query the DHT11 sensor faster than once every 1 second (1 Hz); rapid polling can cause incorrect or frozen readings.
• Connect a 4.7kΩ to 10kΩ pull-up resistor between the Data pin and VCC if using a bare sensor unit (breakout modules usually have this pre-soldered).
• The DHT11 measures 0°C to 50°C with 20%–90% RH range; for projects requiring sub-zero temperatures or higher precision, upgrade to the DHT22 (AM2302) sensor.
• Ensure correct wiring polarity (VCC to 3.3V/5V, GND to Ground, DATA to digital pin); incorrect wiring can permanently damage the internal ASIC chip.

Package includes

• 1 x DHT11 Temperature and Relative Humidity Sensor Module