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Dear Ella (and thanks Luther) – I have not made a motorized tracker, but I have learned from solar water pump experience that the PV-motor solution is delightfully simple. Classic (brush-type) DC motors work fine powered PV-direct. No controller necessary, just two wires. Your only "control" is the shades ...

Whatever you're missing is simply missing – a photo! The "Discussion of Results" and the "Conclusion" make no mention of this thing ever having been built or used. They found a photo of an empty wheelbarrow for the headline, and made a drawing that gives no clue how to assemble it. The Abstract calls ...