How Does an Ultrasonic Sensor Work? They learn the echolocation process. Two mini- activities, which use LEGO. Pre/post quizzes are provided. This lesson and its associated activity enable students to gain a deeper understanding of how robots can take sensor input and use it to make decisions via programming. Research findings are showing that mathematical principles similar to those used in robotics are extremely useful or even necessary for a complete understanding of the human body. Through this lesson, students strengthen their understanding of the functioning of each of the human (and bat) senses by relating them to the different sensors used in robots. Ultrasonic sensors are used in medicine to detect shapes and sizes of otherwise unseen internal body parts. For instance, doctors can determine gender of a fetus in the womb of its mother. Ultrasonic sensors are also used to determine wind speed and direction. HC-SR04 is an ultrasonic ranging module that provides 2 cm to 400 cm non-contact measurement function. The ranging accuracy can reach to 3mm and effectual angle is 15. It can be powered from a 5V power supply. Sources for downloading HC-SR04 pdf. 1 HC-SR04 User Guide Part 1 Ultrasonic Introduction 1. 1 Ultrasonic Definition The human ear can hear sound frequenc y around 20HZ ~ 20KHZ, and ultraso nic is the sound wave beyond the human ability of 20KHZ. 1.2 Ultrasonic distance measurement principle. Sonar and radar technologies are based on the same concepts. Presentation, a Microsoft. In advance, make copies of the Ultrasonic Sensor Pre- Quiz and Ultrasonic Sensor Post- Quiz, one each per student, provided as attachments and slides. For the mini- activities, student pairs use LEGO robot components to experiment with the sensors.)Today we are investigating another sensor. Have you heard of an ultrasonic sensor? This sensor is able to estimate objects in front of it using reflected sound. Does this process sound similar to any other process you know of? Presentation, a Microsoft. Ultrasonic Sensor Post-Quiz (pdf) Ultrasonic Sensor Post-Quiz Answer Key (docx) Ultrasonic Sensor Post-Quiz Answer Key (pdf) Assessment. Sensor is mounted low on your device, you may detect sound reflecting off of the floor. Target Object Material In addition, objects that absorb sound or have a soft or irregular surface, such as a not reflect enough sound to be detected accurately.
They may mention bats, echolocation, radar or sonar). This process is similar to how bats locate objects in their paths. Our lesson includes two mini- activities to help us get familiar with the LEGO NXT ultrasonic sensor. Then in the next class, we will conduct a more- involved activity that gives you the opportunity to program your LEGO robots to move about freely without bumping into LEGO people. To do that, you'll use a LEGO NXT ultrasonic sensor to detect whether anything is in the way.(Continue by showing the presentation and delivering the content in the Lesson Background section.). Lesson Background and Concepts for Teachers. Present the lesson using the content provided in the slide presentation, as described below. The quizzes are embedded in the presentation if you wish to go through them as a class. During the lesson, students engage in two mini- activities (slides 1. How Does the Ultrasonic Sensor Work? Presentation Outline (Slides 1- 1. Administer the pre- quiz by handing out paper copies; the quiz is also on slide 2. The answers are provided for the teacher on slide 3 for discussion after students have completed the quiz. One of the . A transmitter sends out a signal (an ultrasonic wave) that humans cannot hear. And a receiver receives the signal after it has reflected off nearby objects. The sensor times how long it takes for its signals to come back and relays that information to the LEGO brick/computer, which calculates how far away objects are. Ask the students: Does this process sound familiar? Do you know of any animal that are able to sense in a similar way? Explain how bats use echolocation to measure distance and the similar process with a robotic sensor. The time difference between sending and receiving is used to estimate distance.(slide 8) Provide an overview of robotic sensors to keep emphasizing the big picture. Measuring distance using the echolocation concept. Copyright . The ultrasonic sensor can measure distances in centimeters and inches. It can measure from 0 to 2. It provides good readings in sensing large- sized objects with hard surfaces, but has more difficulties reading reflections from soft, curved, thin or small objects.(slide 1. The ultrasonic sensor sends out sound from one side (one of the . Together, the ultrasonic sensor's transmitter and receiver look like a pair of eyes, but it is not a sight sensor. Direct student pairs to follow the instructions on slides 1. NXT ultrasonic sensor.(slide 1. In the first activity, they spend ~1. Make sure they do the . If the object is farther than 1. On a separate sheet of paper, have students provide step- by- step explanations describing how the program works. The programming solution is provided for the teacher on slides 1. Administer the post- quiz by handing out paper copies; the quiz is also on slide 1. The answers are provided on slide 1. This concludes the lesson. Slide 1. 9 contains vocabulary terms and definitions. Next, conduct the associated activity. They practice and learn programming skills and logic design in parallel, seeing how robots take input from ultrasonic sensors and use it to make decisions to move, similar to echolocation. They iterate their designs to success. Robots use sensors to make decisions about movement and actions in much the same manner as humans do to control their muscles and bodily functions. Students' answers reveal their base knowledge of ultrasonic sensors, as well as how humans and bats estimate distances. Have students answer as best as they can. Answers are provided in the Ultrasonic Sensor Pre- Quiz Answer Key (and on slide 3). Post- Introduction Assessment. Hands- On Learning: Observe all students as they engage in the mini- activities described on slides 1. Make sure all pairs are following the slide instructions to experiment with the ultrasonic sensor. Question individual students to verify that they understand how the ultrasonic sensor works. Compare groups' programming answers to the teacher solution provided on slides 1. Review their written observations and programming answers to gauge their comprehension of the topic and readiness for the associated activity. Lesson Summary Assessment. Conversion Practice: Have students practice unit conversions as they convert the following example ultrasonic sensor distance readings from centimeters to inches and vice versa: 5 cm = . Review students' answers to assess their understanding, as well as how much they learned during the course of the lesson. Quiz answers are provided on the Ultrasonic Sensor Post- Quiz Answer Key (and on slide 1. Nair. Copyright. . However, these contents do not necessarily represent the policies of the National Science Foundation, and you should not assume endorsement by the federal government. Last modified: June 8, 2. Sensor Ultrasonic. Get the full title to continue reading from where you left off, or restart the preview.
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