AM2302 (wired DHT22) Digital Temperature and Humidity Sensor

The AM2302 is a wired version of the DTH22, in a large plastic body. It 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). Its 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 when using our library, sensor readings can be up to 2 seconds old.

Simply connect the red 3-5V power, the yellow wire to your data input pin and the black wire to ground. Although it uses a single-wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin.

Compared to DTH11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity, but its larger and more expensive. There is a 5.1K resistor inside the sensor connecting Vcc and DATA so you do not need any additional pullup resistors.

Features:

• Low cost
• High precision
• Capacitive type
• Full range temperature compensated
• Relative humidity and temperature measurement
• Calibrated digital signal
• Outstanding long-term stability
• Extra components not needed
• Long transmission distance, up to 100 meters
• Low power consumption
• 3 pins packaged and fully interchangeable

Specification:

Package Includes:

• 1 x AM2302 Digital Temperature and Humidity Sensor

Useful Links:

• DHTxx Sensors Datasheet
• AM2302 Datasheet