How does the EV3 Ultrasonic sensor works?

The EV3 Ultrasonic sensor is used to measure distance. We can use the sensor to detect whether there is a wall or some other solid object ahead and how far it is. But to master it usage, first we should know how does it work

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17 Aug 2018
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How does the ultrasonic sensor work? - Many of you say the ultrasonic sensor resembles a head with two eyes. Generally speaking:

One eye emits an ultrasonic wave at a very high speed.
When this wave hits the target, the sensor receives the wave reflected back from the target.

The second eye receives the reflected wave. The sensor measures the distance to the target object by measuring the time between the emission and reception of the wave. The more the time passed is, the further the target is.

Courses and lessons with this Tutorial

This Tutorial is used in the following courses and lessons

Robotics with LEGO - Level 1.0 - Adventure in Space

The first level of the Robotics with LEGO curriculum for students in fifth to twelfth grades.

Various constructions with robots are built. Learn how to control the motors so that the robot navigates around the Moon and Earth in various ways. Getting to know the first two sensors. The robot can feel its surroundings with the help of the Touch sensor and avoid obstacles.
The Ultrasonic distance sensor can help the robot avoid obstacles. Students work with concepts like loop, degrees and medium motor. Robots can now do two different actions at the same time - while solving missions on a field, the third motor clears detected obstacles.

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Lesson 5 - Ultrasonic sensor

Returning feedback to students is important. We try to return feedback constantly in the classes. You should also try to return feedback in a structured way - in a form of a digit. Today you will have to grade your students following this article.

Level A2. "Space exploration". Robotics with LEGO

The second level of the Robotics with LEGO curriculum for students in second, third or fourth grades.

A new sensor is introduced - the Ultrasonic distance sensor can help the robot avoid obstacles. Students work with new concepts like loop, degrees and medium motor. Robots can now do two different actions at the same time - while solving missions on a field, the third motor clears detected obstacles. The first robot with chain-treads is built.

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Lesson 4 - Ultrasonic sensor

Introduction

As you have already seen from the title, today’s lesson will be about ultrasound. Prepare to have a discussion with your teacher.

What is ultrasound?
What are the applications of ultrasound?
Is it possible for robots to navigate using ultrasound?
How bats see in dark?

Let's build a bat!

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Robotics with LEGO - Level 4.0 - Kinesthetic and Memory Game (in development)

The seventh level of the Robotics with LEGO curriculum for students in sixth or seventh grade.

In this level, student develop a memory training game. The player must remember series of actions like press a button, shake a pole, pull a lever, show one of many colors. In order to program the game, students use many variables and modify their states. Students create their own custom sounds and images, in order to reflect their own personality in the game. In the end of the level, the game stores top scores even after a full shut down with the help of text files.