The really "ingenious" solution I've seen in the book: "tinyAVR Microcontroller Projects for the Evil Genius™". Author refers to Elektor magazine, December 2008("LED Top with Special Effects"), (magazine probably would be easier to find in the library)Motion sensor include two coils and OPA's, that sense Earth magnetic field. It allows to get speed, direction of rotation, plus synchronize leds for POV effects. Last feature is impossible to obtain with accelerometers or force sensors.I'm not sure why hall effect sensors were not used in design?
Author refers to Elektor magazine, December 2008 ("LED Top with Special Effects").
Accelerometer will give synchronization,
Many MEMS accelerometers have a +/-2g scale and a +/-8g scale - the latter will be needed at least (and it probably will overload), since even a pendulum swinging +/-90 degrees pulls 3g at the bottom of the swing.
as a matter of fact, the acceleration is only 2g but since accelerometer only measures force, it reports 3g
Quoteas a matter of fact, the acceleration is only 2g but since accelerometer only measures force, it reports 3gThat depends whether you are working in an inertial reference frame.... 3D accelerometers are neat precisely because they understand F=ma and general relativity! They only read zero in free-fall.