QSeries Forklift Caster
Wheel material:nylon\steel with Herdar Pullprene®Polyurethane\Semi-steel with Herdar Pullprene®Polyurethane
Hardness:92±3 Shore A, Forklift Caster, Material Handing caster 76*85mm 80*50 mm 80*60mm 80*70mm 80*90mm 160*150mm and so on Ningbo Mywin Caster Co., Ltd. , https://www.mywin-caster.com
Temperature: -20℃-+70℃
Rolling Speed:4 km/h
DIY solar automatic tracking system
Mike Davis, an engineer from Arizona, built a standalone power system in his backyard using a set of homemade solar panels to charge small battery packs continuously. However, he had to manually reposition the panels every few hours to ensure maximum exposure to sunlight. To automate the process, he spent $15 on a used TV antenna rotator from a garage sale, which finally allowed him to adjust the panel’s position automatically.
The first step was to create a fixed wooden frame that held the solar array at the optimal angle—34.6 degrees, matching Arizona's latitude. This design wasn't particularly complex; it mainly used 2x4 lumber, which could be disassembled for easy transport. The frame was originally built in his Florida studio and later shipped to Arizona. According to Davis, since the system is only used during certain times of the year, there was no need for vertical angle adjustments.
Once the structure was complete, the next challenge was setting up the electronic system. His initial plan involved using the original motor controller along with an external tracking system, but that didn’t work well. The original system was designed for occasional manual adjustments, not for consistent daily rotation over several hours.
So, he decided to build a new control system. Since he often used the MBED platform at work, he chose it for this project as well. While some might think using MBED was overkill, Davis found it efficient because he was already familiar with it, allowing him to develop the system quickly. Plus, despite being somewhat oversupplied, the platform offered flexibility for future upgrades or added features like data logging.
The MBED system monitored voltage from two small PV cells placed vertically and adjusted the panel’s angle until both voltages matched. But when he moved the system to Arizona, it didn’t perform as smoothly as in his Florida tests. The intense Arizona sun caused the voltage difference between the panels to be too small. To fix this, he added a small metal piece between the sensors to cast a shadow, creating a larger voltage gap and improving the system’s accuracy.