I'm running the nano off a 12V supply. I have a LIDAR sensor attached that takes 5V but the 5V out of the nano is reading 9V.
I'm guesssing that my nano is broken or at least the regulator on board is?
How is the 12V supply connected to the Nano ?
Post an annotated schematic showing exactly how you have wired this. Also note what points you using to measure voltage.
OK found the fault, it was the regulator on the board. Swapped out the Nano for a new one & all's well.
So do you know how you burned out the first one.
Might be worth exploring just to be sure it does not happen again.
How much current does the LIDAR use?
Good call, the LIDAR's pulling 65-85 mA well over the 40 mA maximum for Nano pins. Thanks for pointing that out.
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That is for the I/O pins not the 5V output pin.
Well actually 20 mA, if the official specs are trustworthy.
(12V-5V ) x0.8A = 5.6W 
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I'm not taking any chances. I'm now powering via an external regulator that can handle the current easily.
Good idea.
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