Product Description:

YJJ DHT11 Digital Temperature And Humidity Sensor Is Used In Smart Homes

Features:

DHT11 is a digital temperature and humidity sensor. By integrating a resistive humidity sensor and an NTC temperature sensor, combined with a high-performance 8-bit microcontroller, it enables digital measurement of environmental temperature and humidity. Its main applications cover multiple fields and meet the requirements of real-time monitoring and automatic control.

Smart Home Control: This technology enables the automatic adjustment of indoor temperature and humidity in the air conditioning system to enhance comfort, and it can also be integrated with a cloud platform for remote monitoring.

Agricultural Environment Optimization: Real-time collection of temperature and humidity data in greenhouses, assisting in adjusting crop growth conditions and improving agricultural efficiency.

Industrial Equipment Maintenance: Monitoring the temperature and humidity in workshops or production environments to ensure stable equipment operation and prevent failures.

Weather and Comfort Assessment: Utilizing low-cost weather stations to collect data or assessing the comfort of living environments, supporting decision-making analysis.

Integration of Automatic Control Systems: Triggering fan cooling or light adjustment based on temperature thresholds to achieve intelligent responses (such as temperature-controlled fan systems).

HVAC Testing: Providing calibration data in professional testing equipment to ensure reliable system performance.

Embedded Development Applications: Widely compatible with platforms such as Arduino and STM32, used for data loggers, household appliances (such as dehumidifiers), and IoT projects.

I. Electrical CharacteristicsI. Electrical Characteristics

‌Operating Voltage‌: 3.3—5.5V DC (compatible with mainstream microcontroller power supply);

‌Operating Current‌:

Measurement Mode: Approximately 0.3—1mA (typical value);

Standby Mode: Approximately 60μA (low power consumption);

‌Interface Type‌: Single-bus digital signal output (requires an external 5.1kΩ pull-up resistor).

II. Measurement Parameters

‌Humidity Range and Accuracy‌:

Range: 20—90% RH (relative humidity);

Accuracy: ±5% RH (typical value at 25°C);

Resolution: 1% RH (output as an integer).

‌Temperature Range and Accuracy‌:

Range: 0—50°C (24 hours);

Accuracy: ±2°C (within the range);

Resolution: 1°C (data output as an integer).

‌Response Time‌: Approximately 10 seconds (reaches 63% steady state value);

‌Sampling Rate‌: 1Hz (can collect data once per second).

III. Communication and Data Format

‌Protocol‌: Single-bus (1-Wire) serial communication, simplifying connection design;

‌Data Format‌:

40-bit data packet (8bit humidity integer + 8bit humidity decimal + 8bit temperature integer + 8bit temperature decimal + 8bit checksum);

Checksum mechanism: Checksum equals the last 8 bits of the first 32 bits of data (ensures transmission reliability);

‌Data Update Cycle‌: >2 seconds (each collection requires an interval).

IV. Other Characteristics

‌Interchangeability‌: Sensors can be completely interchangeable, no need for re-calibration ;

‌Long-term Stability‌: Humidity drift <±1% RH/year (high reliability);

‌Physical Characteristics‌:

4-pin package (VDD, DATA, GND, NC);

Operating Temperature: -20°C to +60°C (storage environment);

Pollution Resistance: Industrial-grade design, but avoid direct contact with pollutants.

Note: DHT11 is suitable for low-cost applications, but has limited accuracy; performance may be affected in high-temperature and high-humidity environments. It is recommended to perform regular calibration.

Specifications: