DHT11 is a Humidity and Temperature Sensor, which generates calibrated digital output. It ensures high reliability by employing an exclusive digital-signal-acquisition technique as well as temperature and humidity sensing technology.
It measures the surrounding air with a capacitive humidity sensor and a thermistor and outputs a digital signal on the data pin (no analog input pins needed).
Each DHT11 element is rigorously calibrated in a laboratory to ensure extreme accuracy in humidity calibration.
The calibration coefficients are stored in the OTP memory as programs that are used by the sensor’s internal signal detecting process.
The single-wire serial interface speeds up and simplifies system integration. Its small size, low power consumption, and signal transmission range of up to 20 meters make it the best choice for a wide range of applications, including the most demanding.
Sandwiched between two electrodes is a moisture-holding substrate (typically a salt or conductive plastic polymer). The ions are released by the substrate as it absorbs water vapor, increasing the conductivity between the electrodes.
The resistance difference between the two electrodes varies proportionally to the relative humidity. Higher relative humidity reduces the resistance between electrodes, whereas lower relative humidity increases the resistance between electrodes.
They also include an NTC temperature sensor/thermistor for temperature measurement. A thermistor is a thermal resistor, which means that its resistance changes with temperature. Technically, all resistors are thermistors but the difference is usually very small and difficult to detect.
Applications of DHT11 Sensor
DHT11 sensor can be used in various applications such as weather stations in the area, automatic climate control, environmental surveillance, etc.
It can be used in medical equipment such as sterilizers, incubators, ventilators, and so on where humidity control is required.
In biological and pharmaceutical processes, humidity sensors are also required there also DHT11 can be brought into use.
Humidity sensors in HVAC (Heating, Ventilation, and Air Conditioning) systems are critical for maintaining proper climate conditions while conserving energy.
Semiconductor For You is a resource hub for electronics engineers and industrialist. With its blend of
technology features, news and new product information, Semiconductor For You keeps designers and
managers up to date with the fastest moving industry in the world.