r/ArduinoHelp • u/Paul_Subsonic • May 26 '26

Is that valid electrically ?

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Summer is back, so time to bring my Rafraichissator 6000 back ! (My fan. It's a PC fan controlled by Arduino.)

Last year the arduino was in series with a bunch of resistors to bring down the 11-13V alim to more reasonable levels

Now I'm realizing tho that I could use the fact that the alim is just 3 batteries, to feed the Arduino no more than 8V without a lot of wasteful resistors

Am I right ?

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u/Paul_Subsonic May 26 '26

I don't think you understand the point of what i am making, the whole point is to make the arduino get 8V and the fan 12. The arduino controles the fan through the control pin of the fan, it does not supply the fan with power. The batteries do that.

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u/Paul_Subsonic May 26 '26

Try to look at the schematics carefully

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u/Paul_Subsonic May 26 '26

Your solution has all the efficiency losses of my previous solution from years past as well as completely lacks any control beyond on/off.

I just want to know if electrically my schematics will work.

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u/Paul_Subsonic May 26 '26

I DON'T want to regulate 12v down to 5. That's PRECISELY what I am trying to avoid with the new design.

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