Build a drawing robot to represent an invisible hand scribbling ships on the drawing sheets
Experiment with different programs. The user should have a choice of 3-4 figures and should be able to choose what the robot draws. This can be solved with push buttons, for example.
Build the figure of a chimney sweep who can climb onto the roof, e.g. on all fours. Use cogwheels and bars for its movements.
Once at the top, the figure raises and lift his hand with the broom. Both movements can be performed using servomotors.
The chimney sweep lowers his broom into the chimney and pulls it back again. Add a string to your figure, with a black block (broom) at the end. The lowering and raising is done using a DC motor that can wind the string onto a suitable spool.