obstacle detection

Obstacle DetectionIntroductory Presentation

Opening ActivityIf you were blindfolded, what senses would you use to find things in the room?

Opening ActivityYou would probably use your hands to feel around to find things by touchYour robot can detect objects with touch by using its Touch Sensor

The signal returns to the bat, telling it the distance to the object.Opening ActivityIf you were a bat, you would not have to run into things, or touch them, to find themA bat sends sound signals outThe sound signals bounce off objects in the surrounding area(sound)(sound)

Opening ActivityYour robot can also use sonar to send ultrasonic sound waves out and detect objectsThis sensor is called the Ultrasonic Sensor

Discussion QuestionsWhy does the Ultrasonic Sensor have two openings in the front ?One opening is for sending out the sound wavesOne opening is for receiving the returning sound waves

Discussion QuestionsThe Touch Sensor must touch an object in order to detect itWhat is the difference between the Ultrasonic Sensor and the Touch Sensor ?The Ultrasonic Sensor does not have to touch an object to detect it

ReviewIn previous activities we told the robot to wait for different conditions. Wait for the robot to hear a soundWait for the Rotation Sensor to read 720 degrees

PreviewNow we will tell the robot to wait for the Touch Sensor to be pressedThen we will wait for the Ultrasonic Sensor to come near an object

PreviewDont forget that the Ultrasonic Sensor can read both inches and centimeters, so check which one you have selected.

As you complete the activity, think about when you would want to use the Ultrasonic Sensor or the Touch Sensor.Preview

Now you have the necessary knowledge to get started in the Obstacle Detection Activity. Good Luck!

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