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Test
Your EQ #145— Answer
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Answer
7
Two sensors are required to find out the
direction of rotation. They
are placed as shown in the diagram below. One of them
is connected to the data input of a D flip-flop, and the
other one to the clock input.
If
the disc rotates anticlockwise, then the clock sensor
goes high first while the data sensor is still low. The
output of the flip-flop equals zero. With clockwise rotation,
the data sensor goes high first, then the clock sensor
goes high. The output of the flip-flop becomes high as
well. The timing diagrams are as shown below.
Contributor:
Naveen PN
Published: August-2002
