moisture sensor relay Help

Discussion in 'Electronics Resources' started by scort, May 7, 2015.

  1. scort

    Thread Starter New Member

    May 7, 2015
    hello electronics community

    i joined this site because i have a wireing question.
    i have an indoor herb garden project i wanted to automate the watering with.
    i ordered the "moisture sensor relay" shown below. it came straight from china for like 2$ shipped.
    in hindsight, i should have ordered a simpler PCB because i have no idea how to wire it haha

    this website sells the same relay kit, but i got mine from Fleabay

    i understand the probe connects to the smaller PCB with the wire pair, but im not sure how to connect the larger relay PCB to the smaller one. the few places online that have this for sale offer no wireing diagrams

    i drew this in paint, with all the locations labeled.


    the smaller PCB:
    VCC (Power+)
    GND (Ground)
    DO (Digital output)
    AO (Analog output)

    the larger PCB:
    DC+ (power+)
    DC- (ground-)
    IN (i have no idea?)

    and the relay side of the larger PCB:
    NO (normally open)
    NC(normally closed)

    the larger PCB also has a high/low jumper set of pins next to the DC+

    id like to use this circuit to activate a small DC water pump when the soil becomes dry

    any help would be greatly apreciated

    RRITESH KAKKAR likes this.
  2. scort

    Thread Starter New Member

    May 7, 2015

  3. Chesky

    New Member

    May 12, 2015
    On the link you send there is very clear details
  4. paulktreg

    AAC Fanatic!

    Jun 2, 2008
    The boards are all powered from +5V. Do you have a 5V power supply?

    Is your water pump 12V?