Temperature Sensor Development Tools DHT22 Temperature and Humidity Sensor

The DHT22 is a capacitive humidity sensing digital temperature and humidity module that contains a calibrated digital signal output of temperature and humidity sensors. It is designed with a dedicated digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. The sensor includes a capacitive sensor wet component and a high-precision temperature measurement device, connected to a high-performance 8-bit microcontroller. It has a small size, low power consumption, and a signal transmission distance of up to 20 metres, making it suitable for all kinds of applications. It is fully interchangeable and easy to integrate into systems with its standard single-bus interface. The DHT22 is a cost-effective and accurate alternative to expensive imported temperature and humidity sensors, with a measurement range of humidity 0-100%RH and temperature -40~80 Celsius, with an accuracy of +-2%RH for humidity and +-0.5Celsius for temperature. It can be used with a special sensor Arduino expansion board for easy implementation of interactive effects related to temperature and humidity perception. “Full range temperature compensation for accurate relative humidity and temperature measurement
Calibrated digital signal output for reliability and stability
Does not require additional components
Long transmission distance of up to 20 metres and low power consumption
4-pin packaging for easy connection and fully interchangeable with other modules
Utilises exclusive digital-signal-collecting-technique and humidity sensing technology
Connected with a high-performance 8-bit microcontroller
Temperature range of -40 to 80 Celsius with a resolution of 0.1 Celsius and accuracy of +/- 0.5 Celsius
Humidity range of 0-100%RH with a resolution of 0.1%RH and accuracy of +/- 2%RH (Max +/- 5%RH)
Repeatability of +/- 1%RH for humidity and +/- 0.2Celsius for temperature
Long-term stability of +/- 0.5%RH/year
Average sensing period of 2 seconds
Small size of 14x18x5.5mm and low power consumption
Powered by a supply voltage of 3.3-6V DC and output signal via single-bus
Sensing element made of Polymer capacitor.