AHT20/AHT21 High-precision Temperature And Humidity Sensor Measurement Module Description: AHT21 is a new generation of intelligent temperature and humidity sensor based on semiconductor technology. The size is very small, the size is only 3*3mm, and the height is only 0.8mm. The compact size and its wide voltage adaptation range (2.2v to 5.5v) can be widely used. Applied to a variety of different