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I built a very similar robot many years ago, in college. I used an IR sensor pointing down to avoid gaps. Great instructable !
Thank you. Now it should look correct. I admit, I am sloppy ! Cheers !
Build Your Own Electric Car!
Error corrected. It doesn't look very elegant, but it shows the correct connection. Sorry it took so long...
Adjustable Micro Power SupplyView Instructable »