Description
The DHT20 Digital Temperature & Humidity Sensor is a high-precision environmental sensor designed for accurate temperature and humidity measurement in embedded systems, IoT devices, weather stations, and automation projects. As the upgraded successor to the DHT11, the DHT20 features a dedicated ASIC chip, a high-performance capacitive humidity sensing element, and a built-in temperature sensor, delivering improved accuracy, faster response, and enhanced long-term stability. Using a standard I2C communication interface, it is easy to integrate with popular development platforms such as Arduino, ESP32, Raspberry Pi, STM32, and other microcontrollers.
Key Features
- Upgraded replacement for DHT11 temperature and humidity sensor.
- High-precision digital temperature and humidity measurement.
- Standard I2C communication interface.
- Factory calibrated for improved accuracy.
- Wide operating voltage from 2.2V to 5.5V DC.
- Built-in ASIC signal processing chip.
- Capacitive humidity sensing technology.
- Excellent long-term stability.
- Fast response time.
- Strong anti-interference capability.
- Wide humidity measurement range.
- Low power consumption.
- Compact 4-pin package.
- Compatible with Arduino, ESP32, Raspberry Pi, STM32 and other controllers.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Type | Digital Temperature & Humidity Sensor |
| Model | DHT20 (AM2301B) |
| Communication Interface | I2C |
| I2C Address | 0x38 (Fixed, Non-changeable) |
| Operating Voltage | 2.2V – 5.5V DC |
| Logic Voltage | 2.5V – 5.5V |
| Pin Configuration | VCC, SDA, GND, SCL |
| Built-in Pull-up Resistors | 4.7kΩ on SDA & SCL |
| Temperature Measurement Range | -40°C to +80°C |
| Temperature Accuracy | ±0.5°C |
| Temperature Resolution | 0.01°C |
| Humidity Measurement Range | 0 – 100% RH |
| Humidity Accuracy | ±3% RH (Typical @ 25°C) |
| Humidity Resolution | 0.024% RH |
| Output Signal | Digital I2C |
| Calibration | Factory Calibrated |
| Sensor Technology | Capacitive Humidity Sensor |
| Material | ABS Plastic |
| Operating Humidity | 0 – 100% RH |
| Operating Temperature | -40°C to +80°C |
Applications
- Weather Stations.
- Smart Home Automation.
- IoT Projects.
- Arduino Projects.
- ESP32 Projects.
- Raspberry Pi Projects.
- STM32 Development.
- Environmental Monitoring.
- Greenhouse Monitoring.
- Smart Agriculture.
- HVAC Systems.
- Air Quality Monitoring.
- Temperature Logging.
- Humidity Logging.
- Industrial Monitoring.
- Data Acquisition Systems.
- Home Weather Monitoring.
- Server Room Monitoring.
- Cold Storage Monitoring.
- Incubators.
- Smart Appliances.
- Educational Projects.
- Robotics.
- Embedded Systems.
- Laboratory Equipment.
Precautions
- Operate only within the specified 2.2V–5.5V supply voltage.
- Do not expose the sensor to corrosive gases or liquids.
- Avoid condensation directly on the sensing element.
- Do not touch the sensor openings with bare hands.
- Ensure correct I2C wiring before powering the sensor.
- Use proper pull-up resistors if required by the application.
- Avoid mechanical shock and excessive vibration.
- Store in a clean and dry environment.
- Keep away from extreme heat sources.