Week 1

 1. Intruduction

Our group project id to build an aoutmatic solar tracker by using Arduino Nano, which can keep the platform with solar panels facing the sun or light source at all times.

The system senses the position of the light source through several photosensitive resistors, when the solar panel is not facing the light source, the photoresistor will output a different amount of current, the collected current data can reflect the position relationship between the solar panel and the light source, thus control servo motor drive flat belt rotation.

2. Disscussion

In the first week disscussion, because we have not get the components yet, so the software part and how to maximize the current difference between the various photosensitive resistors are discussed.

Finally, we came up the idear like the picture below:


 In the picture the red dots represent photosensitive resistors, the gray area in the middle represents the solar panel, and the yellow area around it represents the shade panel. By using the shade panel we can mank the current difference between photoresistors is even greater, which can make the light source tracking is more accurate.



3. Next week

For the week ahead, we will cheak the components, and try point-building and software development.

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week 4

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1. Hardware In this week the hardware part some new problems have arisen, when the systerm is energized the plane will suddenly turn backwards, which is almost destory the systerm. Finally we found that it is caused by the heavy  blanacing weight, when the arm of force is too small, the counterweight block will forcibly drag the plane causing the plane to lean backwards. We waive the solar panel and reduced the weight the problem be solved temporary. Here is the physical circuit we used in the test:   2. Software In this week the software part do not have too much modify, so we spend more time on test the hole system, we solved some problem we found during the test one is the sensitivity of photoresistors and the other one is the shake of the sevor. 3. Test we tested the systerm to mak sure the systerm can meet the basic requirements.   The acture circuit we used in the systerm is the picture below: The LED part is remove from the systerm because we donnot have enough wire to connect a
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week 2

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1. Design Compared with the design of the plane mask in the first week, we further improved the arrangement of the shade panel in this week to make it more effective. In the last vision of the plane we found that when in some special dgree the sigle shade panel will affect several other photoresistors, which may cause light source identification error.   In the new vision, the number of photosensitive resistors is reduced to three, and the four shade panels have be replaced by a T shape shade panel, the photosensitive resistors below the shade panel is used for shuffling control and the photosensitive resistor under the shade panel can do the swing up and down control. When all three photosensitive resistors can come into the light, the platform will face the light. 2. Hardware On the hardware side, we have designed the circuit  schematic diagram is the picture below. The pin A0 to A2 is used to connect the photoresistances to get the light signal. The pin D1 to D5 is be connected to
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