Class 34 LabVIEW 2 adg.docx - CLASS 34 SENSOR CALIBRATION Overview The objective of this activity is to learn how to collect and use sensor input with

Class 34 LabVIEW 2 adg.docx - CLASS 34 SENSOR CALIBRATION...

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C LASS 34: S ENSOR C ALIBRATION Overview The objective of this activity is to learn how to collect and use sensor input with the EV3. You will work with two EV3 sensors: the color sensor, and if you have time, the ultrasonic sensor. You will keep the EV3 tethered to your computer during this activity via the USB cable. Important: because you will keep the EV3 connected to your computer, in order to see the Front Panel, you need to keep all your VIs Targeted to Computer. DO NOT Target to EV3 – some of these icons may not/will not work well then. Expectation Using 4 different colors, Teams should be able to complete Tasks 1, 2, and 3. Teams should collect and save their data (electronic preferred, such an Excel spread sheet, but pictures of your data collected on engineering paper will also work). When you have finished with the data collection, ask one of the Peer Teachers to evaluate and score your results. Questions to answer (and have data to support your conclusions) at the end of the activities 1. Which color sensor settings will give the most accurate color readings for reading the flowers? 2. What height should the sensor be placed above the sample for the most reliable results with both the RGB and Detect color modes? 3. Which colors respond best with RGB and which colors work best with the Detect mode?
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4. Can you use the ultrasonic sensor and the color sensor at the same time? 5. How would you use the ultrasonic sensor with a Lego Vehicle to avoid running into a wall? 6. How could you use the color sensor with a Lego Vehicle to avoid running off the table? Scenario The floral industry is a billion dollar industry in the United States. Customers prefer certain types of flowers and colors. Therefore, development of an automatized system for color classification would benefit the industry. Color readings are affected by distance, however, and so contemporaneous measurement of distance and color is useful. In this activity, your team will implement a basic flower color classifier, as an example task that uses Lego sensors Materials Required: EV3 Lego Kit, especially including the brick, color sensor, motor, and cables. Colored Foam Flowers. A computer with LabVIEW. When you receive the Lego kit from your peer teacher, please connect the EV3 to you laptop, start up LabVIEW, and insure that the EV3 is working and that you can connect to it via the USB cable Task 1: Connection of the color sensor, and simple color sensor readings The EV3 color sensor looks like this:
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  • Fall '07
  • walker
  • It, Color Sensor

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