DHT11 Temperature and Humidity Sensor

The DHT11 is a simple, ultra-low cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the ambient air and outputs a digital signal on the data pin (no required analog input pin is required). It's pretty simple to use, but it requires careful timing to capture data. The only real downside to this sensor is that you can get new data every 2 seconds, so when using our library, sensor readings can be as high as 2 seconds.

Compared to the DHT22, this sensor is less sensitive and operates in a smaller temperature/humidity range, but it is smaller and less expensive.