Please refer to this link:
Refer to the paper in this link and see Figure 1 "Rear View"
You are right! it should be 11 instead of 13 as shown in the electronic circuit
Good idea! Hope it works well with you...
Note: a large hysteresis band can reduce the tracking accuracy, therefore, it should be chosen carefully!
The LDR sensors are placed in the four corners of the PV panel and are put in dark tubes with a small hole on the top to detect the illumination of the sun. The shading resulting from the dark tubes will create a light intensity differential on LDR sensors, i.e. sensors point different angles. The dark tubes are also considered a concentrator of radiation and are used to increase the solar tracker robustness.
The solar tracker above has been tested under a real environment (exposed to the sun) and it is able to instantly track the sun movement.
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