Technical summary
The product allows soil moisture monitoring over a wide range, controlled by a potentiometer to set the corresponding threshold: when the humidity is below the set value, the DO output is high level; above that value, the DO output is low level;
3. The comparator uses the LM393 chip, for stable operation
4. Operating voltage from 3.3V to 5V
5. A fixing bolt hole, convenient installation
6. PCB size: 3.2cm x 1.4cm
Wiring instructions (4 wires)
1 VCC external 3.3V to 5V
2 GND external GND
3 DO small board digital output interface (0 and 1)
4 AO small board analog voltage output
