Logo or turtle drawing

Introduction

Drawing on a large paper using a robot is funny and involving. Use a large paper and try to stay on the paper. Logo programming is oldie but goodie.

Aim

Geometrical shapes, diameter of the circle, basic programming. Proportionality.

Center of gravity, steering.

Robot

Almost any robot will do. We use Asimov 2/ Verne robot with a pen attached to the front part of the robot.

Sensors

No sensors is used, except the servo motor.

Theory

The distance travelled by a rotating wheel is $2\pi r$.

The Asimov 2/ Verne robot travels $2\pi 57$ mm $358$ mm on one full turn, as the diameter of the wheel is $57$ mm. First design the plotting on a paper (or using computer, eg. Inkscape is a good program) and then convert the distances to rotations.

Usually it is easier to code if the speed is lower. Use only speed 10 or 15. The Asimov/ Verne 2 robot turns exactly (about) 90 degrees when Steering=100, Power=10, Angle=195 and Brake=True.

Exercises

• Draw a rectangle with distances 20 cm and 30 cm.
• Draw a house.
• Draw a giraffe.
• Note that the pen draws a wrong line when the robot rotates. How fix to that?
• Try to implement gyroscope to better stay in the given direction.

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