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I have a pair of USB powered fans. I currently have them connected to a Raspberry Pi 3b+ via one of the USB-A connectors, drawing power from the pi.

I have two cron jobs set on the pi - one that disables power to the USB controller every even minute, and then one that re-enables power every odd minute. This effectively turns the RPi into a fan controller. This allows the fans to run in my greenhouse to cycle air, but doesn't keep them running so much that they dry everything out.

I am using uhubctl as described in one of the answers to this question:

How can I cut power coming out of the Pi's USB ports?

My concern is, I am basically adding and removing power to the USB controller every minute of every day. Will this eventually cause damage to the USB controller? Can it cause damage over time?

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  • No idea. Not sure that this is Pi specific.
    – joan
    Oct 21, 2021 at 16:59
  • yes, everything man made fails over a span of a few million years
    – jsotola
    Oct 21, 2021 at 17:32
  • @joan it's specifically about a RPi 3b+ USB controller. I'm not asking about USB controllers in a general sense.
    – Matthew
    Oct 21, 2021 at 19:05

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