Stop at given length from the wall/fi

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Johdanto

Usein on törkeää saada robotti pysähtymään ennen törmäämistään seinään tai esteeseen. Tähän tarkoitukseen sopii ultraääni- tai infrapuna-anturit.

Robotti

Lähes mikä tahansa liikkuva robotti toimii.

Anturit

Käytämme ultraäänianturia, mikä on kytketty robotin porttiin numero 4.

Theory

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

Example Code

The code that stops the robot when in a proximity of a wall.

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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