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  • d_jack commented on innovativetom's instructable Arduino Soil Moisture Sensor8 months ago
    Arduino Soil Moisture Sensor

    Hi all, great setup you have here. Firstly I am new to a lot of this and have forgotten a lot of what I used to know so hopeing someone can help with a problem I have. I have built a watering system using this .... http://www.ebay.com/itm/391289602060?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT I have kept it basic just using this board to switch solenoids directly. I have also used one of these boards as a floatless switch to turn on a drain pump in a sump in case of flooding however as soon as the level drops past the probe it starts a nasty echo pulsing the pump on and off till the level drops clear enough not to retrigger the sensor. What I want to do as add an electrolytic to the output transister on the board that switches the relay to give me 2-5 seconds of run...see more »Hi all, great setup you have here. Firstly I am new to a lot of this and have forgotten a lot of what I used to know so hopeing someone can help with a problem I have. I have built a watering system using this .... http://www.ebay.com/itm/391289602060?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT I have kept it basic just using this board to switch solenoids directly. I have also used one of these boards as a floatless switch to turn on a drain pump in a sump in case of flooding however as soon as the level drops past the probe it starts a nasty echo pulsing the pump on and off till the level drops clear enough not to retrigger the sensor. What I want to do as add an electrolytic to the output transister on the board that switches the relay to give me 2-5 seconds of run on to let the water clear the probe. Could someone please suggest a simple way to do this and component values? Thankyou in advance! Dave

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