Briefly introduced: DHT11 – Temperature and Humidity Sensor

The DHT11 is a simple and inexpensive temperature and humidity sensor, which is ideal for small projects with the Arduino, in which it does not depend on a high degree of accuracy of the measurements. It should be used for indoor measurements.

DHT11 – Temperature and Humidity Sensor

Specifications:

Temperature: 0-50°Celsius, Tolerance: ±2°C
Humidity: 20-95%, Tolerance: 5%
Supply voltage: 3,5-5,5V
only one data port (OneWire interface)
minimal wiring

An alternative is the DHT22/AM2302, whose tolerances are much lower, and the ranges are larger. The wiring is the same for both. However, this is paid for by a higher price.