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The efficient conversion of solar energy to heat energy requires the surface of a solar collector to be perpendicular to the rays of sunlight. The traditional method of using photot detectors mounted to the solar collector and a closed loop controller works well during daylight hours, with unobstructed view of the sun. Variable cloudiness can generate a signal which causes the controller to move the surface of the solar collector away from its optimum (perpendicular to the rays of sunlight) position. The end of the day position of the solar collector may be too far out of position to correctly detect the next day's sunrise.
Develop a control system that automatically correctly positions the surface of a solar collector to be perpendicular to the rays of sunlight.
Develop an open loop control system that uses time-of-day, latitude and longitude data to maintain the surface of the solar collector perpendicular to the rays of sunlight and return the collector to a pre-determined position for storage during night time hours.
Microprocessor based open loop solar collector controller. One US patent.
Z-80 microprocessor, LED's, power supply, stepper motor, assembly language firmware, 2nd order interpolation routines for trigonometric functions, schematic capture.