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Follow The Guidelines

Learn how light sensors use thresholds to categorize values into "light" and "dark" and how to calculate sample thresholds using example values. Use the thresholds in a Switch block to make different actions based on the light sensor readings.

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Follow The Guidelines

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  1. Follow The Guidelines

  2. Opening Activity Make a prediction about how light sensors will use thresholds. • Keep in mind: • We used thresholds with the Sound Sensor in the Clap On, Clap Off Activity • Light sensors can read values from 0 to 100 • Thresholds divide the sensor readings into two categories

  3. Opening Activity • A light sensor uses thresholds to divide the values that it receives into categories of “light” and “dark,” much like the Sound Sensor divides values into “loud” and “quiet.” Light Sensor is over light surface Light Sensor is over dark line

  4. Discussion Questions What is the difference between the values that the Light Sensor reads for darker colors versus lighter colors ? Higher numbers equal brighter colors and lower numbers equal darker colors

  5. Discussion Questions You can read the Light Sensor values by going into View Mode First, select the “Reflected Light” option Then, select the port number Finally, read the light sensor value

  6. Review Remember from Clap On, Clap Off that we are able to calculate thresholds by taking example values with the Sound Sensor. Value that the Light Sensor reads for lighter colors = 70 Value that the Light Sensor reads for darker colors = 52 Threshold = 61 With the example values from the Light Sensor, calculate the sample threshold for the Light Sensor.

  7. Review • In Clap On, Clap Off, we used the threshold to tell the robot to wait for a value above or below the threshold.

  8. Preview Above threshold Action 1 Action 2 Below threshold Now we will use our threshold in a Switch block so that it has to make a decision between two different actions.

  9. Preview • What will “action one” do? Make a right turn

  10. Preview • What will “action two” do? Make a left turn

  11. Preview The robot will do the side with the filled-in sun if it sees a value above the threshold

  12. Preview The robot will do the side with the dark sun if it sees a value below the threshold

  13. Preview Which direction willthe robot turn if the Light Sensor reads 54? 54 is above threshold, so your robot will make a right turn Hint: look at the threshold

  14. Preview We will also add a Loop block, which allows your robot to perform the same set of actions many times.

  15. Preview As you complete the activity, decide why you would want to run the same behavior many times?

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