AM2302 is defined as the wired version of DHT22. This humidity Capacitive Digital Temperature and Humidity Module is a temperature and humidity composite sensor providing a calibrated digital signal output. AM2302 sensor offers highly precise, more accurate, and works in a bigger range of temperature/humidity. But quite larger and more expensive compared to DHT11. Using dedicated digital module acquisition technology and temperature, humidity sensors ensure the products with high reliability and excellent long-term stability. The module consists of a capacitive wet sensor and a high-precision NTC temperature sensor connected to a high-performance 8-bit microcontroller.

It measures the surrounding air and outputs a digital signal on the data pin (no analogue input pins are needed). It’s quite simple to use but requires careful timing to grab data. 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.

AM2302 offers easier connections by simply connecting the red wire to 3-5V power, the yellow wire to your data input pin, and the black wire to the ground. Although it uses a single wire to send data it is not as One Wire compatible. In case if you want multiple sensors, each one must have its own data pin. There is no need for any additional pullup resistors as it consists of a 5.1K resistor inside the sensor f0r connecting VCC and DATA. Its makes AM2302 Temperature and Humidity Sensor Module features Small size & low consumption & long transmission distance (100m)  makes it ideal for all kinds of harsh application occasions. These are designed as Single-row packaged with four pins, making the connection very convenient.