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Another fun are litte motor driven units fueled by sunlight:
Symets
and it's easily put together: a motor from a old cd-rom drive, some capacitors from an old mainboard and a solar engine (link to www.beam-wiki.org). the solar panel charges the capacitors up to a level and then the stored energy is released to the motor making the symet to move around. |
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this was the first try, but the capacitors are way too far above the ground, so this one got a wire coil.
the solar cell is a nice one from schott solar, making the symet to move without direct sunlight, but then it may be as slow as one move a minute ;-) |
| this is the second try and this symet is more compact with a cheaper solar cell amd a simple solar engine. as you see just the two npn transistor version with a resistor and a zener-diode. so this one needs sunlight to hop around. |
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and here with the solar cell on top. as spacer to the solar panel two old button cells are just glued in between. |
Some links about symets:
• many sources at Google images
• to the Junkbots Sample Chapter (junkbots.solarbotics.com) an excellent source
• solar engine at beam wiki (www.beam-wiki.org)
And always don't forget: Have fun!
• back to bertnase.de