Humidity And Temperature Sensor

DHT11 is an inexpensive sensor that provides calibrated digital outputs for ambient temperature and relative humidity. It comes in a single row 4-pin package and operates from 3 to 5.5V power supply. It can measure temperature from 0-50 °C with an accuracy of ±2°C and relative humidity ranging from 20-95% with an accuracy of ±5%. It has got its own proprietary 1-wire protocol, and therefore, the communication between the sensor and a microcontroller is not possible through a direct interface with any of its peripherals. The protocol must be implemented in the firmware of the MCU through bit-banging of an I/O pin.

Relative Humidity Resolution:0.1%RH Repeatability: 1%RH Accuracy:25 5%RH Interchangeability Fully interchangeable Response Time 1/e(63%)25 20s 1m/s air 6s Sluggish:< 0.3%RH Long-term Stability:< 0.5%RH/yr Temperature Resolution:0.1 Repeatability: .2 Accuracy:25 0.5 Response Time:1/e(63%)20s Electrical Characteristics Power Supply:DC2.7-5.5V Current:1mA Standby:60 A Sampling Period:>2s Pin Definition 1.VDD 2.SDA 3.GND 4.SCL

DHT22 capacitive humidity sensing digital temperature and humidity module is one that contains the compound has been calibrated digital signal output of the temperature and humidity sensors. Application of a dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure that the product has high reliability and excellent long-term stability.