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Problem statement: An optimal control on two axes and design for solar tracker which&#13; called altitude and azimuth is challenge. Approach: The phototransistor with the shade that blocks the&#13; screen was employed as a detector of solar beam radiation. The height of the screen determined the&#13; sensitivity operation or period of tracking in this solar tracker. The phototransistor is particularly&#13; designed to detect solar bean radiation thoroughly through the two axes with the operating time. The&#13; mechanism of this solar tracker is that it has a capacity of solar tracking in every 10 min,&#13; approximately, which respond in terms of time at about 37° sec-1 with and operating point at 0.3 sec.&#13; Results: Our solar tracker obtained an average deviation at about 2.5deg;h-1. In weak sunlight however,&#13; the value varies and fluctuates rapidly depending on sky condition. Conclusion: The accuracy of solar&#13; position tracking function satisfied our goal as well. There is only average of 2.5deg; error shown. The&#13; experiment also shows that the error rate diminishes as the solar radiance expand. However, we hope&#13; to develop this device to be more exact in the position

The Solar Tracking System by Using Digital Solar Position Sensor