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Can I Use Opto isolator to protect my arduino and other components connected to its 5V pin Answered

So I am using two power sources. 5V from arduino and 12v 2A transformer for my stepper motor. 5V and 12V share common ground. My problem is that other components(LCD display, Water level Indicator) connected to 5V source from arduino won't function correctly when 12V is on. I think because my 5v isn't isolated and excess voltage from 12V goes through it. 

I use 12V to power up my stepper motor and relays. Can optoisolator do the job in isolating these two voltages voltages?

Discussions

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steveastrouk

4 years ago

Show your circuit.

Done properly, you should have no "need" for optoisolation, in this case./

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Downunder35m

4 years ago

None of my Arduinos have a built in power source....

Arduinos work just fine with 12V...

If I assume you use a 12V power supply to drive all and you mean the display is powered by the arduino through the normal shield connections than I simply assume your power supply is too weak.
You failed to include any info on the power consumption, what type of motor or how it is all connected.
We work quite hard on our skills to provide suitable answers but at least I am not clairvoyant yet, so without proper details I can only provide guesswork...

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Josehf Murchison

4 years ago

Not knowing your wiring if the control circuit is 5 volts you can use an optoisolator to control the 12 volt circuit.