DHT22 Temperature And Humidity Sensor Module

DHT22 Temperature And Humidity Sensor Module

The DHT22 is a basic, 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). It's fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so sensor readings can be up to 2 seconds old.

Specifications

• Operating Voltage: 3.5V to 5.5V
• Operating current: 0.3mA (measuring) 60uA (standby)
• Output: Serial data
• Temperature Range: -40°C to 80°C
• Humidity Range: 0% to 100%
• Resolution: Temperature and Humidity both are 16-bit
• Accuracy: ±0.5°C and ±1%

Features

• Calibrated digital signal
• Low power consumption
• High precision
• Capacitive type
• Full range temperature compensated
• Relative humidity and temperature measurement
• Outstanding long-term stability
  
• Extra components are not needed
• Long transmission distance
• 4 pins packaged and fully interchangeable

Pin Description

• Vcc : Power supply 3.5V to 5.5V
• Data : Outputs both Temperature and Humidity through serial Data
  
• NC : No Connection and hence not used
• Ground : Connected to the ground of the circuit