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thats the solution I had in mind. The angel of 90 degrees is not that important. All we need to know is that the 2 sensors are not at 180 degrees and in which 2 quadrant they are located in.
- sameerashraf June 09, 2011Also we need to have the assumption that the plate is rotating at a constant speed else this solution wont work.
In case of variable rotation speed we would need 3 sensors. Put them on say at 1 O' Clock, 2 O'Clock and 3 O'Clock. Take 3 time stamps. from 3 sensors.
If sensor 1Time stamp is > sensor 2 Time Stamp> sensor 3 Time stamp the plate is moving counter clock wise else clock wise.