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  • Author Author: sasquatch84
  • Date Created: Date Created
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Let's try this again

sasquatch84

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Ok, so I grabbed another Nano and got it all wired up like the last one.  I soldered a diode directly onto the solenoid valve contacts.  Maybe I should have just put it on the circuit board?  Anyone think I should?  Let me know. 

Also, I tried my hand at making a schematic.  Let me know if this makes sense.

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I'm not plugging anything in until I get at least a little feedback on here. (gulp!)

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  • Continuing: The diode soldered to the solenoid is actually a good idea as it deals with the counter EMF right where is occurs. Here is an example of part of your schematic. My schematic assumes that the output of the Arduino can handle the current demands of the relay (it probably can't) and that the Arduino will output a HIGH to energize the relay. I remember that you have a relay board which probably will take care of drawing a very small current from the Arduino and use the main power to the relay board to actually energize the relay coil. I have also shown a diode for the relay coil but the relay board that you have is a commercial product and they would have built in diodes to protect their own design so you probably do not need to worry about this. You can use the diode on the solenoid as it is soldered just switch the polarity of your hookup wires so that the plus wire goes to the banded end of the diode. To enlarge my schematic or any picture in these postings just click on it.

     

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    John

  • in reply to jw0752

    Perhaps one downside to soldering the diode directly to the solenoid though is that if someone (especially a third party) has to replace the valve at a later point in time, then they may not realise that they have to add the diode to the new replacement solenoid.

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