DHT22 temperature-humidity sensor
ABOUT DHT22
(Digital Temperature and Humidity Sensor Module)
The DHT22 is a digital temperature and humidity sensor. It uses to measure humidity and temperature by using a thermistor.
Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of
harsh application occasions.
TECHNICAL specification
- 3 to 5V power supply and I/O
- 2.5mA max current
- Good for 0-100% humidity readings with 2-5% accuracy
- Good for -40 to 80°C temperature readings ±0.5°C accuracy
- No more than 0.5 Hz sampling rate (once every 2 seconds)
- Body size 27mm x 59mm x 13.5mm (1.05" x 2.32" x 0.53")
- 4 pins, 0.1" spacing
- Weight 2.4g
Pin sequence number: 1 2 3 4 (from left to right direction)
1.PIN NO-1 VDD POWER SUPPLY
2.PIN NO-2 DATA SIGNAL
3.PIN NO-3 NULL
4.PIN NO 4 GROUND
Temperature Measuring Component
- To measure temperature this sensor uses a Thermistor.
- A thermistor is a variable resistor that changes its resistance with a change of temperature. These sensors are made by sintering of semiconductive materials, such as ceramic or polymers in order to the large change in a resistor with small changes in temperature. As temperature changes, there is a change in the value of resistance by which we measure the temperature of our environment.
APPLICATION OF DHT22
- It is used for temperature and humidity measurement.
- It is used as a weather station to measure temperature and humidity in the air.
- It is an automatic climate control sensor.
- It is also used as an environmental monitoring device.
INTERFACE WITH ARDUINO UNO
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