Feature:Size: 36 x 15 x 7mm
Voltage: 3.3-12VDC
Current: working <20ma, output <30ma
Interface: +-DO AO
DO digital quantity / AO analog quantity
Uses: to detect soil moisture
Principle: The soil moisture probe detects the humidity, and the voltage comparator determines the humidity. When the humidity is greater than the set value, the DO outputs a low level.
Instructions for use:
1. “+” is connected to the positive pole of the power supply, and “-” is connected to the negative pole of the power supply. Do not reverse the connection, otherwise the chip may be burned out. After the power is connected, the “P” power indicator lights up and the module works normally.
2. The blue potentiometer can be adjusted clockwise/counterclockwise to increase/decrease the probe detection sensitivity. Take the “thermal sensor” as an example. Assume that the default is 25°C trigger and the “DO” output is active low. After clockwise adjustment, the temperature will trigger below 25 °C. Counterclockwise triggers above 25 °C.
3. When the potentiometer is adjusted clockwise until the “S” output indicator is on, it indicates that the adjustment range has exceeded the test threshold, and the counterclockwise adjustment until the adjustment cannot be made exceeds the threshold. When adjusting, the threshold cannot be exceeded, otherwise it will not work properly. When the potentiometer is used only for the "DO" port, it is not associated with the "AO" output.
4. The “AO” output is analog (voltage), which can be directly detected by the AD port of the MCU.
Package includes:
3 x Soil Moisture Detection Module
3 x Probe
