The DHT22 Sensor, also known as the AM2302, is a high-accuracy digital temperature and humidity sensor designed for environmental monitoring and automation applications. It combines a capacitive humidity sensor and a high-precision thermistor with an internal microcontroller that provides calibrated digital output signals. The sensor delivers reliable and stable measurements with excellent long-term performance.
Unlike the DHT11, the DHT22 offers a wider temperature range, better humidity accuracy, and higher measurement precision, making it suitable for professional and industrial-grade projects. It communicates using a single-wire digital interface, allowing easy connection with Arduino, ESP32, Raspberry Pi, STM32, and other microcontrollers.
Features
High precision temperature and humidity sensing
Factory calibrated digital output
Wide measurement range
Excellent long-term stability
Low power consumption
Single-wire serial communication
Fast response and reliable performance
Easy interface with microcontrollers
Technical Specifications
Sensor Type: Digital Temperature & Humidity Sensor
Model: DHT22 / AM2302
Operating Voltage: 3.3V – 6V DC
Humidity Measuring Range: 0% – 100% RH
Humidity Accuracy: ±2% RH
Temperature Measuring Range: -40°C to +80°C
Temperature Accuracy: ±0.5°C
Output Signal: Digital Signal
Sampling Rate: 0.5Hz (one reading every 2 seconds)
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