1 .This is a simple moisture sensor can be used to detect soil moisture, when soil water shortage, module output a high level, whereas the output low level. Using the sensor produces an automatically watering device , let you don't manage the plants in the garden.
2 .The sensitivity can be adjust by blue potentiometer
3 .Working voltage : 3.3 V -- 5 V
4 . Double output mode, the digital output is simple and more accurate analog output.
5 .Set the fixed bolt hole, convenient installation
6 .Small board PCB size: 3.2 cm * 1.4 cm
7 .Power indicator light (red) and digital switch output indicator light (green)
8 . comparator adopted LM393 chips, work stability
Interface specification (4 wire):
VCC —— external 3.3 V to 5 V
GND —— external GND
DO —— small plate digital output interface (0 and 1)
AO —— small plate analog output interface