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25	25	Techniques other than optical interruption are also used for encoders including magnets and capacitance sensors, but optical encoders are most common.
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27		~~Exercise~~: Ask a mentor to help you take apart an old-style mouse (the kind that had a heavy metal ball instead of bright lights underneath). In these mice, the ball turned two shafts (X and Y directions) that each had an optical rotary encoder attached. The mouse movement was detected by counting the interruptions of the light beam in each axis.
	27	'''Exercise''': Ask a mentor to help you take apart an old-style mouse (the kind that had a heavy metal ball instead of bright lights underneath). In these mice, the ball turned two shafts (X and Y directions) that each had an optical rotary encoder attached. The mouse movement was detected by counting the interruptions of the light beam in each axis.