Mounting the Sun direction sensor of the solar tracking controller
The Sun position sensor must be securely mounted on the moving part of the solar tracker. It is best if the sensor is not disturbed by shadows of nearby objects such as threes, light poles, other solar trackers, shadow of parts of the same solar tracker. Use cylindrical M4 screws to fit the head inside the box without a washer to ensure water tightness. Use the cable grip on one side to release the cable. In theory, any side of the tracker is fine but typically the top side is the one less disturbed by shadows of surrounding objects. The important thing is that the sensor is oriented so that the blue mark is at the top right corner.
Connect the board to four relays at the left schematic demonstrates. Connect the motors with the contacts of the relays as shown to the right.