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stroboscope
#1
Hello. I think a stroboscope would be useful and easy to do using the camera flash led. It could be an enough accurate and a safer way to measure angular rotation speed in many cases.

Good job.
.
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#2
For using your smartphone as a stroboscope I suggest the Physics Toolbox app.
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#3
Is the stroboscope in the pro version of the physics toolbox? That is only available on android. For iOS "stroboscopeCamera" provides a free stroboscope.
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#4
The stroboscope has been on our todo list for a while. It should not be too hard to add it but we have not tackled it yet as its use is limited and unfortunately, the results depend strongly on the phone because there is no guarantee that the light will react as fast as needed.
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