[Product name]: Soil humidity sensor

[Voltage]: 3.3-12V DC

[Current]:Operating <20ma

[Output]: <30ma

[Interface]:+-DOA0 DO digital/AO analog

[Usage]: To detect soil humidity

[Working principle]: The soil humidity is detected by the probe onthe sensor and then is determined via the voltage comparator.When the humidity is greater than the set value, pin DO outputs a low level.

Instructions For Use

1.[+] connects to the positive pole of the power supply, while [-] connects tothe negative. Please do not reverse them to avoid burning out the chip. Afterpowering, the power indicator [P] lights up, which represents the moduleworks normally.

2.Adjust the blue potentiometer clockwise or counterclockwise to increaseor decrease the detection sensitivity. Assuming that the powered probedoes not contact water or soil, D0 will be at high level if we rotate counter-clockwise to adjust the LED of S to the just-off; when it comes with water,the analog value decreases, and D0 outputs a low level with S LED on.

3.When the potentiometer is rotated clockwise until the output indicator [S)lights up, the test threshold is exceeded. lf we rotate counterclockwise untilit is stuck, the threshold is exceeded. When adjusting, remember to operatewithin the threshold. Otherwise, it cannot work normally. lt has nothing todo with the [AO] output as the potentiometer is only adopted for the [D0].

4.[A0] outputs analog value of the voltage, which can be directly detected through the AD port of the MCU.