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Issue with solenoid valve

Nic12424

Sep 21, 2022
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Hi there, I am working on a Bluetooth-controlled solenoid valve yet can't seem to get the valve working. When the valve is unplugged the relay activates as it should and 12V is supplied to the valve terminal when it should be. As soon as I plug in the valve, however, the relay only triggers once and then the ESP32/circuit does not work anymore. Any ideas on what could be causing this issue?
Thanks
 

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Bluejets

Oct 5, 2014
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Sounds like a brown out on the supply line.
Any freewheeling diode on the solenoid..?? or the relay coil for that matter.

Solenoids, like motors etc. can cause inductive spikes that intefere with microcrontrollers and the like.
Show a circuit drawing of what you have and the code.
 

Nic12424

Sep 21, 2022
2
Joined
Sep 21, 2022
Messages
2
Sounds like a brown out on the supply line.
Any freewheeling diode on the solenoid..?? or the relay coil for that matter.

Solenoids, like motors etc. can cause inductive spikes that intefere with microcrontrollers and the like.
Show a circuit drawing of what you have and the code.
Here is the code and the schematic. So you think I should try adding a diode across the solenoid or some other special arrangement? Thanks
 

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Bluejets

Oct 5, 2014
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So you think I should try adding a diode across the solenoid or some other special arrangement?

Definetely.
Look for freewheeling or flyback diode connection.

You may also need capacitors of appropriate values placed on the supply line to the uC close to the uC.
Try the diodes first though, on both the relay coil and the solenoid coil.
 

Minder

Apr 24, 2015
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Agree, RY1 requires a reverse Diode across the coil.
 

danadak

Feb 19, 2021
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Feb 19, 2021
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When you use bypass capacitors on supplies like this with fast
transient loads cap technology matters. Low esr helps.

In this chart OSCON caps are polymer tantalums :

1663762312519.png


Regards, Dana.
 
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