One of the first,successfull,BEAM-like projects is this solar pendulum.Don't ask me how it exactly works,I got the circuit from here.The red circle is a coil which is connected to the electronic circuit.A couple of magnets are on the end of the metal rod which swings.As you can see I've used an old Apple mouse to hide the electronics in.In bright sunlight you get a big kick from the coil,strong enough to make the wooden stand fall over.So that is something which needs some attention.
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