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Topic: Is arduino equiped with AC protection? (Read 1 time) previous topic - next topic

dhenry

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Is arduino equiped with AC protection?


Yes: the pins get burned up, protecting the core.

durkinnj

Okay. My original question is answered. The core will be protected. That is good in case I screw something up. an AC waveform can ride on a DC level. If you combine 5V DC and 20V AC you will have an AC waveform with the 0V point at 5V. It basically just shifts the waveform up. Although I can't see the waveform I can measure both DC and AC current using a multimeter.

JimboZA

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If you combine 5V DC and 20V AC you will have an AC waveform with the 0V point at 5V. It basically just shifts the waveform up.


OK, but why would we do this?

Roy from ITCrowd: Have you tried turning it off an on again?
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durkinnj

Honestly, I forget that part. I'm sure it has some applications but I am unaware of any right now. I didn't do that though. That's just what I have to work with.

winner10920

Ah missed that analog read part, you want to read that full 18v spectrum? And don't trust your meter, dc and ac voltage reading aren't perfect especially if both are present at the same time, it could be just pulsating dc not ac or a more complex waveform, you really need to oscope it to know what you are dealing with, you could be trying to solve a nonexistent problem, either way a voltage dividerlike he suggested would be fine, and if you are unsure a 5.1zener used correctly will ensure the voltage after the divider is between 0 and +5v
Basically the zener cathode (+ or banded end) will go to the input, cathode to ground and you will be protected
This would be after your voltage divider

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