The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data. The DHT11 detects water vapor by measuring the electrical resistance between two electrodes. The humidity sensing component is a moisture holding substrate with electrodes applied to the surface. When water vapor is absorbed by the substrate, ions are released by the substrate which increases the conductivity between the electrodes. The change in resistance between the two electrodes is proportional to the relative humidity. Higher relative humidity decreases the resistance between the electrodes, while lower relative humidity increases the resistance between the electrodes.
About this item:-
- The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor.
- The sensor module is including resistive humidity sensing component and ntc temperature testing
- The compatible digital temperature humidity sensor module is component and connected with 8-byte mcu
- This is useful module is fast response, great anti-interference ability and durable