Soil moisture Sensor/Corrosion Resistance Probe

Application:

The soil moisture probe is for detecting moisture, and the voltage comparator is for evaluating the amount of moisture; When the humidity is higher than the set value, the output will be low level.

Using introduction:

1. "+" connects the positive power; "-" connects the negative Power. Please do not connect reverse, or it will burn the chip. After connection, the power indicator lamp "P" will be on and the module will operate normally

2. Clockwise / counterclockwise adjustment of the blue potentiometer, can improve / reduce the detection sensitivity. Take "Thermal Sensor" as an example, if the default trigger is 25 Celsius, make the low level output is valid; Clockwise after adjustment, it is when the temperature is lower than 25 Celsius, it can be activated; If set counterclockwise, it can shoot more than 25 ° C

3. when adjusted clockwise, the potentiometer to "S" output indicator is on, represents a setting range higher than the test threshold; If the adjustment counterclockwise to its maximum extent, it exceeds the threshold. When adjusting, please do not leave them above the threshold, or it cannot be used normally. The potentiometer setting is only used for do port, it has no importance for AO output

4. The AO output is an analog value (voltage) and can be detected through the AD MCU port.

When the detected value is higher than the set value, a low level will be output, the triode will turn on, and the load will work. 1K is a current limiting resistor and 10K is a removable resistor