KY-015 DHT11 Temperature And Humidity Sensor Module

KY-015 DHT11 Temperature And Humidity Sensor Module is a widely-used digital environmental sensor that provides calibrated temperature and humidity readings through a simple single-wire serial interface. This module integrates the DHT11 sensor onto a breakout board with a built-in pull-up resistor and filtering capacitor, ensuring immediate compatibility with microcontrollers like Arduino, ESP8266, and Raspberry Pi. Consequently, it eliminates the need for complex external circuitry, allowing developers to focus on data processing rather than hardware stabilization. Furthermore, the digital signal output ensures high reliability and excellent long-term stability by utilizing a resistive-type humidity measurement component and an NTC temperature measurement component. Therefore, you should choose the KY-015 module for your next weather station or home automation project where cost-effectiveness and ease of use are paramount.

Key Features:

• Digital Signal Output: The module transmits data via a single-bus digital signal, which significantly reduces the number of I/O pins required on the host controller.
• Pre-Calibrated: Every sensor undergoes accurate calibration in a laboratory setting, with the coefficients stored in internal OTP memory for precise measurement.
• Plug-and-Play Design: The breakout board includes the necessary pull-up resistor on the data line, enabling direct connection to digital pins without extra components.
• Low Power Consumption: It consumes minimal current during measurement and enters a low-power “sleep” mode between readings to preserve energy.
• Long Transmission Distance: The robust digital signal allows the sensor to communicate over cable lengths up to 20 meters, making it suitable for remote monitoring.

Technical Specifications:

• Operating Voltage: 3.3 V to 5.5 V DC
• Humidity Measurement Range: 20% to 90% RH
• Humidity Accuracy: ±5.0% RH
• Temperature Measurement Range: 0°C to 50°C
• Temperature Accuracy: ±2.0°C
• Sampling Period: ≥ 1 second (Wait at least 1s between readings)
• Output Type: Digital 40-bit packet (8-bit integral RH + 8-bit decimal RH + 8-bit integral T + 8-bit decimal T + 8-bit checksum)

Mechanical Specifications:

• Sensor Housing: Perforated plastic casing for optimal airflow to the sensing elements.
• PCB Material: FR-4 high-quality glass epoxy.
• Pin Header: 3-pin male header for easy jumper wire connection.
• Mounting: Includes a central mounting hole for secure attachment to enclosures or frames.

Dimensions:

• Board Length: ≈ 18.5 mm
• Board Width: ≈ 15.0 mm
• Total Height: ≈ 7.5 mm (Including sensor housing)
• Pin Pitch: 2.54 mm (Standard breadboard compatibility)

Pinout and Wiring:

• Pin S (Signal): Connect this pin to a digital I/O pin on your microcontroller (e.g., Arduino D2).
• Pin Center (VCC): Connect to the positive power supply (3.3 V or 5 V).
• Pin – (GND): Connect to the common ground of your circuit.
• Wiring Note: However, you must ensure your code includes a library like “DHT.h” to correctly decode the timing-sensitive digital pulses from the signal pin.

Datasheet Reference:

• Download DHT11 Temperature and Humidity Sensor Datasheet

Commonly Used in:

• Arduino Learning Kits: It serves as a fundamental peripheral for students learning about environmental data acquisition.
• Smart Home Systems: Integrating into HVAC controllers to monitor indoor climate conditions.
• Data Loggers: Recording ambient conditions for laboratory or storage room monitoring.

Applications:

• Weather Stations: Providing humidity and temperature data for local environmental tracking.
• Greenhouse Automation: Triggering fans or misters when specific humidity or temperature thresholds are met.
• Dehumidifier Control: Acting as the primary feedback loop for automated moisture control devices.

Equivalent Models:

• DHT22 (AM2302): Offers higher precision and a wider measurement range, however, it uses a similar protocol and footprint.
• SHT31-D (Sensirion): A more advanced I2C-based sensor providing superior accuracy for professional-grade applications.
• AM2301: A wired version of the DHT21, suitable for remote sensing where a module board is not required.

Package Includes:

• 1 x KY-015 DHT11 Temperature and Humidity Sensor Module