The lizard from Lego Spike Prime is a simple model for learning the basics of programming. To assemble you will need one additional gear wheel with 36 teeth (the old EV3 kit will do). Gears and twin-engine design allow the model to go forward, backward and turn around on the spot, but only on a smooth flat surface. This disadvantage is due to the fact that the legs hang freely like a pendulum and “scratch” on the surface when walking. Any interference leads to a fall.
A distance sensor is used to detect obstacles.
When programming, concepts such as the full and incomplete form of a conditional operator, nested conditions, and a loop are used. The program uses subroutine calls using messages.