DHT11 Sensor

The DHT 11 is a low-powered electronic device that lets us get the value of the temperature and the moisture and it uses 1 wire protocol. The sensor consists of a capacitive humidity sensor and a Thermistor connected to a high-performance 8-bit microcontroller. It measures the surrounding air and outputs a digital signal on the data pin (no analogue input pins needed).DHT11 is strictly factory calibrated that is extremely accurate on humidity calibration, hence easy to interface with other microcontrollers. Using dedicated digital module acquisition technology and temperature, humidity sensors ensure the products with high reliability and excellent long-term stability.

In the OTP memory, calibration coefficients stored as programs, further used for the sensor’s internal signal detecting process. The single-wire serial interface protocol provides system integration quick and easy. Thus its compact size, low power consumption, and up-to-20 meter signal transmission range make it an ideal choice for various applications. DHT11 module component is designed as a 4-pin single row pin package.

The four pins of the DHT 11 are the VCC, GND, No Use pin, and DATA pin. Through the DATA pin, the information of the temperature and the humidity will be sent. DHT 11 is not the best temperature and humidity sensing module out in the market but it is reasonably accurate. It is about +-5% and +-2% accurate for temperature and humidity.