Stop at given length from the wall

Robot

Any robot (with tires or treads, perhaps walking robots too) will work.

Sensors

The ultrasonic (distance) sensor is used.

Theory

The ultrasonic sensor is a sonar radar that works similar to the bats. You should check the performance of the sensor specially if it is not working properly. A hand might be a not optimal device for checking -- You should use something harder, eg. plastic of cardboad. The maximum working distance is about 2 meters, and the smallest distance is about 10 cm.

Example Code

Exercises

• Make the robot speed dependent on the distance to the wall, e.g. by using a formula speed = distance.
• Use the ideas shown in previous part (Following a Line) to follow the wall at 10 cm apart.
• Follow a line (previous part) until the robot finds a wall at 10 cm apart from the wall.
• If you have multiple robots, make the robots follow a line and each others, not colliding with the robot in front of.
• Use the ultrasonic sensor to listen if there is other robots using ultrasonic sensors.

This course is supported by Meet and Code. The course is made in collaboration with Robotiikka- ja tiedekasvatus ry.

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