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+--- Thread: RPM based on light or color? (/showthread.php?tid=2226)
RPM based on light or color? - ronco66 - 01-20-2026
I use the Camera Stopwatch Color to measure RPM of pulleys by placing a piece of blue tape on the pulley then measuring between 2 peaks inverting the time and multiplying by 60. It would be great if there was a way to automate this for realtime measurements.
RE: RPM based on light or color? - Elisabeth Brenner - 01-27-2026
(01-20-2026, 11:15 PM)ronco66 Wrote: I use the Camera Stopwatch Color to measure RPM of pulleys by placing a piece of blue tape on the pulley then measuring between 2 peaks inverting the time and multiplying by 60. It would be great if there was a way to automate this for realtime measurements.
If I am understanding you correctly you want phyphox to automaticallydo the time inversion and multiplication by 60. This should be possible to achieve with the phyphox editor (https://phyphox.org/editor/). If you need assistance with that you can write us an email at contact@phyphox.org.
RE: RPM based on light or color? - Jens Noriʇzsɔɥ - 01-27-2026
Have you tried “Camera Spectrum: Brightness”? RPM is shown at the top. It works surprisingly well even with rather low contrast. The frequency resolution of the FFT is (acquisition rate)/(number of samples) or 1/(time span used for the FFT) – if that‘s ok…
“Camera Spectrum: Color” could also be implemented that way, however, the title could be really easily misunderstood…
