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Topic: Q: Connect 12v solenoid valve to relay board. (Read 120 times) previous topic - next topic


Good day everyone, thanks for your view.

I am still new with relay environment (electrical/electronic stuff),

Currently im working on project that use to control 12v solenoid valve with Arduino UNO.

Item used:
12v Solenoid valve
2 channel relay board
12v power adapter
Female power jack
Arduino UNO (Ignore the Yellow wiring(line))
Moisture sensor (Ignore this/wiring)

I am trying to control the valve ON/OFF via arduino uno.

I have uploaded my diagram, and the question is, is my diagram correct? If its wrong, i hope somebody can correct it.

Files too big, i have upload it to imgur,

Sorry for the messy color!

Thank You,



The circuit looks good

Since I never used arduino relay board make sure it have transistor built in and diodes to protect against spikes, if in doubt or dont understand dont hesitate to contact me


If the Wall Wart is DC and the solenoid is DC place a kick back diode across the solenoid.
The way you have it in your schematic isn't the same as how you have it wired up!


The way you have it in your schematic isn't the same as how you have it wired up!


which diode you advice for 12V 0.7A solenoid valve?


Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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