DHT22 - Temperature and Humidity Sensor Module
Description:
DHT22 Temperature and Humidity Sensor Module is a high-precision digital sensor designed for accurate environmental monitoring. It is widely used in weather stations, smart homes, greenhouses, and various IoT-based environmental monitoring systems. The DHT22 is also known as AM2302 and is favored for its excellent stability, long-distance communication capability, and accurate sensing of both temperature and humidity. module combines a capacitive humidity sensor and a thermistor to measure the surrounding air, providing a digital signal output on a single data pin, making it easy to interface with popular microcontrollers like Arduino, Raspberry Pi, ESP32, and other embedded systems.
Features:
1. Measures both Temperature and Humidity
2. Digital signal output (no need for ADC)
3. High accuracy and long-term stability
4. Low power consumption
5. Long-distance signal transmission capability (up to 20 meters)
6. Fully calibrated output
7. Easy to interface with microcontrollers
8. Compact and lightweight design
9. Built-in pull-up resistor for reliable communication
Diagram:
Specifications:
| Sensor Model | DHT22 / AM2302 |
| Temperature Measurement Range | -40°C to +80°C |
| Temperature Accuracy | ±0.5°C |
| Humidity Measurement Range | 0% RH to 100% RH |
| Humidity Accuracy | ±2% RH (Typical) |
| Operating Voltage | 3.3V to 6V DC |
| Max Current Consumption | 2.5 mA during measurement |
| Sampling Rate | 0.5 Hz |
| Signal Transmission Distance | Up to 20 meters |
| Storage Conditions | Temperature: -40°C to +80°C / Humidity: 0-100% RH |
| Dimensions | 28mm x 12mm x 10mm |
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