Aosong AM2301 Capacitance Digital Temperature and Humidity Temperature Sensor DHT-22 DIY KIT for Made Hygrometer Humidity and Temperature Controller use in Arduino Uno R3 DHT21 Black

Feature & Application:

Full range temperature compensated

Relative humidity and temperature measurement

Calibrated digital signal

Outstanding long-term stability

Extra components not needed

Long transmission distance

Low power consumption

4 pins packaged and fully interchangeable

The DHT21 measures

. Relative humidity is the amount of water vapor in air vs. the saturation point of water vapor in air. At the saturation point, water vapor starts to condense and accumulate on surfaces forming dew.

The saturation point changes with air temperature. Cold air can hold less water vapor before it becomes saturated, and hot air can hold more water vapor before it becomes saturated.

The formula to calculate relative humidity is:

Relative humidity is expressed as a percentage. At 100% RH, condensation occurs, and at 0% RH, the air is completely dry.

• Type: AM2301 (DHT21)
• Accuracy resolution: 0.1
• Measurement range: 0-100%RH
• Temperature measurement range: -40° ~ +80°
• Humidity measurement precision: ±3%RH
• Temperature measurement precision: ±0.5°
• Size: 5.7cm x 2.6cm x 1.5cm (approx)
• Full range temperature compensated
• Relative humidity and temperature measurement
• Calibrated digital signal
• Outstanding long-term stability
• Extra components not needed
• Long transmission distance
• Low power consumption
• 4 pins packaged and fully interchangeable