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Figure 5.2 Waiting for the Sun
When there is a cloud cover.
In case of cloudy weather, the base remains fixed to insure that the board
is still facing or tracking the exact direction of the sun after the clouds fade. In
this
condition, the board goes back to the home position (waiting mode) to
protect itself from the heavy wind and storms, and remains stable until the sun
appears again as in the figure 5.3.
Figure 5.3 the clouds position
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How the system is switching-Off at night:
When the east-west sensors read a very few values of light, the system will
stop and the board returns to the horizontal position as the whole system gets
back to the primary status (see figure 5.4).
Figure 5.4 the darkness position
The Problem of variation between Seasons
In the different seasons, the Sun leans to the north side or the south side of
this system. The tilt issue was treated by moving the whole base at the moment
of sunrise and stops in the direction of the sun, and the board starts to move and
follow the sun as in the figure5.5.
Figure 5.5 Search for the sun in the north and south direction
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The problem of accidental light when the system is
off at night
If any light fall on the system at night during the system's inactivity, the sensors
feel that light, and the system will search for it, but the light is no longer there so
the system will return to the primary inactive mode.
The movement of the system when searching for light at the
beginning of
the day
At sunrise, sensors are sensitive to the light. In this case,
the board takes the
vertical position by using the stepper motor, and then the base will move also by
the motor responsible for this job towards the north-south directions, the base
stops moving when the sensors values of the North and south are
equal and then
the board starts to move with the sun in the direction of the West as in figure 5.6
and flow chart in figure 5.8.
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