The DHT-11 Digital Temperature and Humidity Sensor is a crucial, low-cost sensor that measures the surrounding air’s temperature and humidity. It employs a capacitive humidity sensor and a thermistor to provide a digital signal on the data pin, eliminating the need for analog input pins.

While simple to use, it requires precise timing to obtain data. The only drawback of this sensor is that it can provide new data every two seconds, so it’s recommended to use a sensor reading interval of two seconds or more in your code. Compared to the DHT22, this sensor is less accurate and precise and has a smaller temperature/humidity range.

Despite its limitations compared to the DHT22, it is smaller, making it a helpful option in specific applications.