DHT22 Humidity and Temperature Sensor

SENSING PRINCIPLE: Uses a capacitive humidity sensing element and a precision thermistor to measure relative humidity and temperature. The internal circuitry processes the measurements and converts them into a calibrated digital signal.
PIN CONFIGURATION: VCC (3.3V–5V power supply), DATA (Digital data output), GND (Ground connection).
OUTPUT SIGNAL: Provides a single-wire bidirectional digital output signal containing both temperature and humidity data.
OPERATING VOLTAGE: Operates with a supply voltage typically between 3.3V and 5V DC.
MEASUREMENT RANGE: Temperature range from −40°C to +80°C and humidity range from 0% to 100% RH.
MEASUREMENT ACCURACY: Temperature accuracy of approximately ±0.5°C and humidity accuracy of about ±2% RH.
RESOLUTION: Temperature resolution of 0.1°C and humidity resolution of 0.1% RH.
SAMPLING RATE: Sensor updates measurement data approximately once every 2 seconds.
PHYSICAL CHARACTERISTICS: Compact module with approximate dimensions of 3 cm × 2 cm × 1 cm and lightweight construction.
APPLICATION SCOPE: Widely used in HVAC systems, weather stations, environmental monitoring systems, data loggers, home automation, humidity control systems, and industrial monitoring applications.