I have an arduino micro that works fine off USB. I need to power it from an external 12V power supply. When I connect the 12V supply to the adjacent VIN and GND pins, the arduino will not power up. When I measure the power at VIN, it's 12V. When I measure power at the 5V pin, it's also 12V. If I disconnect the external power and go back to USB, it powers up.
Blown regulator?
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4Or unconnected ground? Otherwise I can't imagine 12V on 5V without blowing MCU.KIIV– KIIV2017年07月28日 21:39:38 +00:00Commented Jul 28, 2017 at 21:39
1 Answer 1
In comparing this with another Arduino Micro, it appears that the regulator is malfunctioning.
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Is this actually an Arduino product, or some unspecified knock-off?Chris Stratton– Chris Stratton2018年05月06日 16:38:41 +00:00Commented May 6, 2018 at 16:38
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Actual Arduino. I certainly won't rule out that I fried it at some earlier point, but it's clear that the regulator is not working.plinth– plinth2018年05月08日 14:16:40 +00:00Commented May 8, 2018 at 14:16
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It may blow the entire board. Feeding 12V into the regulated 5V line would likely damage the CPU and various other subsystems.Duncan C– Duncan C2020年04月25日 21:45:27 +00:00Commented Apr 25, 2020 at 21:45