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The DHT11 Humidity and Temperature Sensor Module provides calibrated readings using a single digital pin on your microcontroller.
The DHT11 sensor provides 8 bits of precision for both humidity and temperature. It uses a single line for bidirectional serial communications. An Arduino library is available to simplify operation. It can measure temperatures from 0° to 50° Celsius (32° to 122° Fahrenheit) and humidity from 20% to 95% Relative Humidity.
This sensor works with both 3.3V and 5V microcontroller systems.