1. Obstacle Detection
Ultrasonic Sensor

2. Opening Activity
If you were blindfolded, what senses would you use to find things in the room?

3. Your robot can detect objects with “touch” by using its Touch Sensor
Opening Activity
You would probably use your hands to feel around to find things by touch
Your robot can detect objects with “touch” by using its Touch Sensor

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

5. This sensor is called the Ultrasonic Sensor
Your robot can also use sonar to send ultrasonic sound waves out and detect objects
This sensor is called the Ultrasonic Sensor

6. Discussion Questions
Why does the Ultrasonic Sensor have two openings in the front ?
One opening is for sending out the sound waves
One opening is for receiving the returning sound waves

7. Discussion Questions
What is the difference between the Ultrasonic Sensor and the Touch Sensor ?
The Ultrasonic Sensor does not have to touch an object to detect it
The Touch Sensor must touch an object
in order to detect it

8. Write this program.

11. Download program and run.