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Having taken a sabbatical from programming Big Chaser, I decided to do a ball bot. There are a pair of pudding bowls or mixing bowls attached directly onto a threaded bar. Also attached to this bar is a servo (modified for continuous rotation). When the servo is powered, it moves the bar, attempting to turn it and the pudding bowls. Hanging from and perpendicular to this servo is an unmodified servo, attached to which is the battery and the control. When this second servo moves, it swings the battery ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/pudding-bowl-special