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Dropping stones onto your LEGO doesn't sound like a kind way to treat your expensive Technic parts; I imagine that small bits of stone and dirt will fall through a belt of Technic Chain Link or Technic Chain Tread , what with them being a chain rather than a belt. This will then lead to other bits of your contraption becoming polluted with abrasive gunk. ...

I once built an NXT robot that opened and closed a set of blinds. The blinds had a rod that you could spin to open and close them, and the rod had a hole at the end, which made it pretty easy to hook up to a mindstorms motor. I made two different versions. One version was a "clapper" - with a microphone sensor, and one was a smarter version, that used a ...