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  <created-at type="datetime">2009-11-03T14:51:38-05:00</created-at>
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  <title>Mobile Robot PI Wall-Following Controller</title>
  <updated-at type="datetime">2009-11-03T14:53:32-05:00</updated-at>
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    <comment>
      <content>Setpoint is 40cm  (distance of left-wall)
Y is sonar reading
E is Error
Up is proportional component of controller
Ui is integral component of controller
U is the signal of controller
VelMe is the velocity of left motor in PWM
VelMd is the velocity of right motor in PWM</content>
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      <updated-at type="datetime">2009-11-03T14:51:38-05:00</updated-at>
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