GND: power supply -, ground

VCC: Power supply+5V

A: Analog output, usually connected to ADC acquisition pin

D: Digital output, output high and low levels (no water droplet high level, with water droplets reaching the threshold low level)

Note

1. Please use 5V power supply, high voltage can easily cause scalding or chip burning.

2. The wiring between the sensing acquisition module and the data processing module is not positive or negative.