Introduction
This manual provides comprehensive instructions for the HiLetgo DHT11 Digital Temperature and Humidity Sensor Module. This module is designed for accurate digital output of temperature and humidity readings, featuring a pre-calibrated DHT11 sensor, a bypass capacitor, and a pull-up resistor. Its single-wire communication protocol simplifies integration into various electronic projects.
Package Contents
Each package includes the following items:
- 5 x DHT11 Sensor Modules
- 5 x Dupont Cables
A photograph showing five HiLetgo DHT11 sensor modules and five sets of Dupont connection wires, as included in the package.
Technical Specifications
| Power Supply Voltage | 3.3V - 5.5V DC |
| Output | Single bus digital signal |
| Humidity Measuring Range | 20% - 90% RH |
| Temperature Measuring Range | 0°C - 50°C |
| Humidity Measurement Accuracy | ±5% RH |
| Temperature Measurement Accuracy | ±2°C |
| Humidity Resolution | 1% RH |
| Temperature Resolution | 1°C |
| Exchangeability | Fully interchangeable |
| Long Term Stability | <±1% RH |
| Module Dimensions | 28mm x 12mm x 7.2mm (approx. 1.1 x 0.47 x 0.28 inches) |
| Model Number | 3-01-0039-1 |
Setup and Connection
The DHT11 module features a simple three-pin interface for easy integration with microcontrollers.
Pin Description
- VCC: Connect to an external power supply of 3.3V to 5.5V.
- GND: Connect to the external ground.
- DO (Data Out): Connect to a digital input/output (IO) port of your microcontroller. This pin transmits the digital temperature and humidity data.
A close-up view of the HiLetgo DHT11 sensor module's underside, clearly showing the three pins labeled VCC, GND, and DO (Data Out) for connection.
Wiring Diagram Example
Connect the module to your microcontroller (e.g., Arduino, ESP32) using the provided Dupont cables as follows:
- DHT11 VCC pin to Microcontroller 3.3V or 5V pin.
- DHT11 GND pin to Microcontroller GND pin.
- DHT11 DO pin to a digital input pin on your Microcontroller.
A coiled set of three-wire Dupont cables, typically used for connecting the DHT11 module to a microcontroller.
Operating Instructions
The DHT11 sensor communicates via a single-wire digital signal. This protocol simplifies data acquisition, requiring minimal programming effort.
Data Acquisition
- Ensure the module is correctly powered within the 3.3V to 5.5V DC range.
- Connect the DO pin to a digital input on your microcontroller.
- Utilize a compatible library or implement the single-wire communication protocol in your microcontroller's firmware to request and read data from the sensor. Many open-source libraries are available for popular platforms like Arduino and Raspberry Pi.
- The sensor will transmit a digital signal containing both temperature and humidity values.
Key Features
- Digital Output: Provides direct digital readings, eliminating the need for analog-to-digital conversion.
- Pre-calibrated: Factory calibrated, ensuring reliable measurements without user calibration.
- Single Bus Interface: Reduces wiring complexity and microcontroller pin usage.
Maintenance
The HiLetgo DHT11 sensor module is designed for durability and requires minimal maintenance.
- Cleaning: Keep the sensor clean and free from dust or debris. Use a soft, dry brush if necessary. Avoid using liquids or solvents.
- Environmental Conditions: Operate the sensor within its specified temperature and humidity ranges to ensure optimal performance and longevity. Avoid exposure to corrosive gases or extreme condensation.
- Storage: When not in use, store the modules in a dry, anti-static environment.
Troubleshooting
- No Readings or Incorrect Data:
- Verify all connections (VCC, GND, DO) are secure and correctly wired to the microcontroller.
- Ensure the power supply voltage is within the 3.3V to 5.5V range.
- Check your microcontroller code for correct sensor initialization and data reading protocol. Ensure you are using a compatible library if applicable.
- Confirm the data pin on the microcontroller is configured as an input.
- Sensor Not Detected:
- Double-check the wiring, especially the data line.
- Ensure the sensor module is receiving adequate power.
- Try a different digital I/O pin on your microcontroller.
- Inaccurate Readings:
- While the DHT11 is pre-calibrated, its accuracy is ±2°C for temperature and ±5% RH for humidity. For applications requiring higher precision, consider its limitations.
- Ensure the sensor is not exposed to direct heat sources, strong air currents, or moisture that could skew readings.
- Allow the sensor to stabilize in its environment for a few minutes after power-up.
Warranty and Support
For technical support or any issues you may encounter with your HiLetgo DHT11 Digital Temperature and Humidity Sensor Module, please contact HiLetgo customer support.
Email: support@hiletgo.com
Please refer to the product model number 3-01-0039-1 when contacting support.
Information regarding returns and replacements typically follows the retailer's policy, which for this product is generally 30 days from the date of purchase.