DHT11 Temperature and Humidity Sensor

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

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