Step 2Motor, Grears, Shaft, and Wheels
You can also use a motor and gearbox.
It does not matter how you make it.
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It would be interesting to try it with tilt switchs (**MERCURY is BAD kids**) and perhaps make two stages of power, voltage divider between cells for those times when it tilts beyond a certain range the additional voltage is switched on.
Also would be neat to try a magnetic pendulem with reed switchs.
Good Job.