DHT22 AM2302 Digital Temperature and Humidity Sensor
Description:
DHT22, also known as AM2302, is a high-precision digital temperature and humidity sensor commonly used in environmental monitoring systems, smart homes, weather stations, and IoT projects. It provides calibrated digital output for both temperature and humidity readings through a single-wire data interface, making it very easy to connect to microcontrollers like Arduino, ESP32, Raspberry Pi, and other platforms.Compared to its predecessor (DHT11), the DHT22 offers a wider range of measurement, higher accuracy, and better long-term stability, making it suitable for both indoor and outdoor environmental monitoring.
Features:
1. Measures both temperature and humidity
2. Fully calibrated digital output
3. Single-wire communication (Easy interface)
4. Wide measurement range
5. High accuracy and stability
6. Low power consumption
7. Long transmission distance capability (up to 20 meters)
8. Built-in pull-up resistor in some versions
9. Suitable for long-term monitoring applications
Diagram:
Specifications:
| Temperature Range | -40°C to +80°C |
| Temperature Accuracy | ±0.5°C (Typical) |
| Humidity Range | 0% to 100% RH |
| Humidity Accuracy | ±2% to 5% RH |
| Output Signal | Digital signal via single-bus |
| Operating Voltage | 3.3V to 6V DC |
| Maximum Current | 2.5mA during data conversion |
| Data Transmission Distance | Up to 20 meters |
| Dimensions | Approx. 28mm x 12mm x 10mm |
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