The AM2301 module is an internally-calibrated digital sensor that measures temperature and humidity. It can measure humidity from 0 to 99.9% with an accuracy of ±2% and temperatures from -40 to 80°C with an accuracy of ±3°C.

This digital module uses a single-wire protocol for communication. So, apart from the power supply pins, it only needs one digital pin to communicate with the microcontroller. Using this protocol, we can transfer data through this line for a maximum distance of 20 meters.

DHT21, another name for this module is one of the well-known families of DHT temperature and humidity sensors. The specifications of DHT21 and DHT22 are very similar, except for the main differences, including the case design and the physical appearance of the output pins AM2301 has three wires for the output, whereas DHT22 uses metal pins.

Specification

• Operating voltage: 3.3 to 5.5 volts
• Communication protocol: single-wire digital
• Maximum distance for data transmission on the data line: 20 meters
• Operating temperature: -40 to 80°C
• Temperature resolution: 0.1℃ (16 bits)
• Temperature measurement accuracy: ±0.3°C
• Humidity measurement range: 0 to 99.9% relative humidity
• Humidity measurement accuracy: ±3%

Applications

• HVAC Test and inspection equipment
• Car Data Logger
• consumer goods Automatic control
• Weather Station Appliances
• Humidistat
• Medical
• Dehumidifier

Tutorial: Youtube