This board can help you to water the tree / plants automatically when the moisture in the soil is too low . It can connect to water pump to pump the water , adjust time to pump ( 2 to 246 second ) after detect low moisture. Pump will automatic off after time out,

Technical information:

    * Require Power Supply DC 12V
    * POT to adjust the sensivity to detect the moiseture in soil
    * 3 Level of detection to start pump
    * Current consume 60mA when relay turn on.  and 30mA when stand by mode ( Relay off )
    * 3 LED indicator how much the moiseture
    * On time of Relay after board can detect low moisture adjust 2 to 246 second
    * Relay can handler 240VAC at 7A
    * PCB size 2.31" x 1.29"
    * English instruction how to set-up / the schematic

Download User Manual