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Does anyone know how self levelling 'laser levels' work?

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RoGeorge:
The OP was asking about the small ones, for the interior "building rooms in a house".

The big ones for the construction sites, shockproof and good for up to hundreds of meters (but I never had or used any of those), seems to have two internal motors for auto-leveling, so they don't have the usual rattling parts that needs locking.

For the curious, at around minute 6, the inside mechanism can be seen very well.  On a desktop, by pausing the video then pressing the keys "," or "." (same keys with the symbols "<" and ">"), the video can be seen frame by frame:

MathWizard:
The problem of a self-leveling laser would make for a good design test. Ages ago I tried thinking of how an analog light following robot might work, I never got there yet, but it's fun to think about. I bet I'd get a lot closer now again. I can't wait till my day job slows down again. Then going digital with micro-controllers, that's another route I'd like to try from scratch, that would probably be way easier.

I have a bunch of little sensors like optical position readers and stuff salvaged from printers/etc, but I've never taken the time to do anything with them, even copy and paste. But now as I learn more from EE from books, I can't wait to try to make stuff too. Like remote control curtains's, like Doc Brown might have LOL.

ConKbot:
The cheap home improvement store ones ones I've seen have just been two line-laser units a in frame suspended from a two-axis pivot. A rare earth magnet on the bottom of the pendulum frame, and copper disc for damping the movement of the magnet.The lasers would blink of the bottom if the pendulum assembly hit a conductive ring around the damping disc so you know it's not level.
The one in the YouTube video in the first post looks like its the same. Between the beam quality looking like a line laser module, and the way the jiggle looks similar to the one I've used, i'd bet its constructed in a similar manner.

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