Objects and Obstacles
Use the Ultrasonic Sensor to detect and react to the Cuboid.
- Read through the pupil material in the EV3 Classroom App.
- Collect information about how the Ultrasonic Sensor works.
- You’ll need a tape measure to measure out where to place the Cuboid in this lesson.
- In order to complete this lesson, the pupils will have to have built the Driving Base model, which will take about 30 minutes to complete.
2. Engage (5 Min.)
- Use the ideas in the ‘Ignite a Discussion’ section below to engage your pupils in a discussion relating to this lesson.
- Divide your class into teams of two pupils.
3. Explore (20 Min.)
- Have each team build the Cuboid, and the Ultrasonic Sensor extension for their Driving Base.
- Allow the pupils time to use the provided programming stacks to explore ways in which the Ultrasonic Sensor can be used.
4. Explain (5 Min.)
- Facilitate a discussion about how the Ultrasonic Sensor could be used to measure distance.
5. Elaborate (15 Min.)
- Challenge your pupils to program their Driving Bases to beep faster or louder as they get closer to the Cuboid.
- Don’t forget to leave some time for tidying up.
- Give feedback on each pupil’s performance.
- To simplify the process, you can use the assessment rubrics that have been provided.
Ignite a Discussion
Modular robots are useful because they can be extended and reconfigured to perform a wide range of tasks. Adding sensors enables them to react to their environment so that they can do things like detect obstacles and avoid collisions.
Use these questions to engage your pupils in a discussion about robots that can detect objects:
- Do you know of any robots that can detect objects?
- Why is it useful for robots to be able to detect objects?
- What’s ultrasound, and how does an Ultrasonic Sensor work?
Simplify this lesson by:
- Spending additional time explaining how to use the Ultrasonic Sensor
Take this lesson to the next level by:
- Challenging your pupils to program an autonomous robot that avoids obstacles
- Having your pupils use the Touch Sensor instead of the Ultrasonic Sensor to detect obstacles
Teacher Observation Checklist
Establish a scale that suits your needs, for example:
- Partially accomplished
- Fully accomplished
Use the following success criteria to evaluate your pupils’ progress:
- The pupils are able to use the Ultrasonic Sensor to detect an object.
- The pupils are able to change the parameters of the Ultrasonic Sensor Blocks to detect different distances.
- The pupils are able to expand their programs to react dynamically to the detected distance.
Have each pupil choose the level that they feel best represents their performance.
- Bronze: I’ve used the Ultrasonic Sensor to stop at an object.
- Silver: I’ve used the Ultrasonic Sensor to detect the distance to an object.
- Gold: I’ve made one aspect of the program react dynamically to the distance to an object.
- Platinum: I’ve made several aspects of the program react dynamically to the distance to an object.
Language Arts Extension
To incorporate the development of language arts skills:
- Have your pupils prepare and deliver a presentation explaining how Ultrasonic Sensors work.
Note: This will require additional time.
The pupils who enjoyed this lesson might be interested in exploring these career pathways:
- Manufacturing and Engineering (Machine Technology)
- Manufacturing and Engineering (Pre-Engineering)