Description
The DHT22 Sensor provides precise measurements of temperature and relative humidity using a capacitive humidity sensor and a thermistor. Unlike its predecessor DHT11, the DHT22 offers wider measurement ranges and higher accuracy. It communicates via a single-wire digital interface, simplifying connection to microcontrollers such as Arduino, ESP32, and Raspberry Pi. Common applications include environmental monitoring, smart home automation, weather stations, and IoT-based projects.
Key Features
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Measures temperature (-40°C to 80°C) and humidity (0–100% RH)
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High accuracy and stability
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Digital single-wire interface for easy connection
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Long-term reliability for indoor and outdoor applications
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Compact, low-power, and breadboard-friendly
Specifications
| Feature | Details |
|---|---|
| Operating Voltage | 3.3–5V DC |
| Temperature Range | -40°C to 80°C |
| Humidity Range | 0–100% RH |
| Accuracy | ±0.5°C (temperature), ±2% RH (humidity) |
| Communication | Single-wire digital |
| Sampling Rate | 0.5 Hz (once every 2 seconds) |
| Dimensions | 15 × 12 × 5 mm |
Applications
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Weather stations and environmental monitoring
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Home automation and HVAC control
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IoT and smart agriculture projects
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Educational and DIY electronics projects
Compatible Boards / Circuits
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Arduino (Uno, Nano, Mega)
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ESP32 / ESP8266
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Raspberry Pi (via GPIO input)
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Can interface with displays, data loggers, and cloud dashboards
Reviews
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