What is the DHT22?
The DHT22 is a high-precision digital temperature and humidity sensor designed for a wide range of applications. It offers accurate temperature measurements from -40 to 80℃ with a precision of ±0.5℃ and humidity measurements from 0% to 100% RH with an accuracy of ±2%. This sensor is perfect for smart homes, greenhouses, and other DIY projects. It seamlessly integrates with Raspberry Pi, Arduino, ESP32, and other popular microcontrollers.
Operating Mechanisms of the DHT22
The DHT22 operates by utilizing its integrated sensors to measure temperature and humidity with high precision. Here's a breakdown of its operating mechanisms:
- Temperature Measurement: The DHT22 measures temperature in the range of -40 to 80℃ with an accuracy of ±0.5℃. This makes it suitable for a variety of applications requiring precise temperature monitoring.
- Humidity Measurement: The DHT22 measures humidity from 0% to 100% RH with an accuracy of ±2%, ensuring reliable and accurate humidity data for your projects.
- Digital Output: The DHT22 outputs a single-bus digital signal, facilitating bidirectional serial data transmission. This simplifies integration with microcontrollers.
- Versatile Capability: The DHT22 is adaptable for diverse applications, delivering precise temperature and humidity measurements. It is perfect for smart homes, greenhouses, and other DIY projects.
- Long-Term Durability: The DHT22 is designed for long-term use, offering durability and reliability for extended monitoring needs.
- Convenience: The DHT22 includes essential wiring for easy attachment and is equipped with a secure screw hole for convenient installation and stability.
By combining these mechanisms, the DHT22 provides a comprehensive solution for environmental sensing, making it an essential component in many modern electronic projects.
Pins
DHT22 Pinout
VCC (Power Supply: +3.3V to +5V)
This pin is used to supply power to the DHT22. The sensor operates within a voltage range of 3.3V to 5V.
Connection: Connect this pin to the 3.3V or 5V power supply from your microcontroller or development board.
GND (Ground)
This pin is the ground connection for the sensor. It should be connected to the ground of your power supply or microcontroller.
Connection: Connect this pin to the ground (GND) of your microcontroller or development board.
DATA (Serial Data)
This pin is used for the digital data signal. It transfers temperature and humidity data to the microcontroller.
Connection: Connect this pin to a digital I/O pin on your microcontroller.
Technical Specifications
| Specification | Details |
|---|---|
| Temperature Range | -40 to 80℃ |
| Temperature Accuracy | ±0.5℃ |
| Humidity Range | 0 to 100% RH |
| Humidity Accuracy | ±2% |
| Power Supply | 3.3V to 5V |
| Output Signal | Digital |
| Dimensions | 15.1 x 25 x 7.7mm |
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