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Jan 1 '15 at 15:35 comment added Ben The sensor is in the main brush housing. When the robot sucks up dirt, it hits the sensor.
Jan 1 '15 at 3:36 comment added Paul How does a piezoelectric sensor detect the dirt? Is the dirt thrust upon it by the vacuum? Or does the presence of dirt affect the sensor in some indirect way?
Dec 22 '14 at 20:27 history answered Ben CC BY-SA 3.0