I am new to Arduino and working on a simple project - an automated water dispenser. I have got all the components required but my solenoid is 24v NOT 12v as required. A friend suggested that I can make it work using a relay.
Could anyone suggest a circuit diagram or a tutorial link?
From you brief description, I would guess the valve is AC operated. So, yes, a relay would be the easiest way to control the AC to the solenoid valve.
Paul
It depends a lot.
Is it DC? You got a lot of power? Use a 12-24 DC-DC boost (like this one)
If you don't have a big enough 12V power supply, add a separate 24V power supply to drive the pump and use a MOSFET (like this one, scheme may vary depending on your transistor) or a relay to drive the valve.
Is it AC? Use a relay (example here, replace bulb with water walve in your case).
Images above are not mine, they were found on the internet so double check when making your circuit.
Do you have 24V DC available? Or only 12V DC?