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  • 17/09/2020

    It works fine. Note that input voltage MUST be in range 3.6 to 6.0V (maximum rating of used LDO regulator). Output analog voltage is from about 2.83V down to 1.73V, higher moisture = lower voltage. Output voltage of course depends on penetration depth, deeper = better sensitivity, so put it into the soil up to the line drawn on PCB. Design is simple, TLC555 generates square wave signal, which goes into the low pass filter compund by 10k resistor and "sensor capacitor" (created on PCB) - higher capacitance, better filtering, lower amplitude. This signal is than captured through diode at output capacitor (peak detector with slow discharge). Current consumption at 5V is about 4mA. If you want to use it at 3.3V, you can use it as is just note that LDO will be in dropout state so it will not filter the input power and output voltage will be lower than show in attached picture. Or, you can remove the LDO and short it's IN and OUT pads on PCB by wire. I have drawn the schematic and made some measurements for different conditions: put on free air, in the dry and wet soil and in water (100% and 50% in it). See the attached picture for results.

  • 04/05/2021

    Recieved product in 10 days from China to Finland. Great, now I can strat building tomato watering system.

  • 21/12/2020

    exactly what i ordered. took longer than expected to arrive but nonetheless arrived intact

  • 06/04/2021

    All good... Wait for the next project to use them...

  • 14/02/2021

    I haven't tested them yet, but compared to the previous version they look much improved

  • 26/10/2020

    Fast delivery.

  • 17/08/2020

    Very satisfied, good merchandise.

  • 28/07/2020

    arrived not tried it yet

  • 24/07/2020

    works as it should

  • 05/10/2018

    Very good for automatic watering of flower plants. With the proper arduino programming true watering-on-demand gets you splendid flower vases


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