TABLET LESSONSWhat is the Colour Sensor? • What are they? Sensors that detect the intensity of...
Transcript of TABLET LESSONSWhat is the Colour Sensor? • What are they? Sensors that detect the intensity of...
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TABLET LESSONS
COLOUR SENSOR
By Sanjay and Arvind Seshan
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Lesson Objectives
1. Learn how to use the Colour Sensor
2. Learn about Coast and Brake
© EV3Lessons.com, 2016, (Last edit: 7/26/2016)
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What is a sensor?• A sensor lets an EV3 program measure and collect data
about is surroundings
• The EV3 sensors include:– Colour – measures color and darkness– Gyro – measures rotation of robot – Ultrasonic – measures distance to nearby surfaces– Touch – measures contact with surface– Infrared – measures IR remote’s signals
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Image from: http://www.ucalgary.ca/IOSTEM/files/IOSTEM/media_crop/44/public/sensors.jpg
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What is the Colour Sensor?• What are they? Sensors that detect the intensity of light that
enters it• Three modes: Colour, Reflected Light Intensity and Ambient Light
Intensity– Color Mode: Recognizes 7 colours (black, brown, blue, green, yellow,
red, white) and No Color– Reflected Light: Measures the intensity of the light reflected back from
a lamp that emits a red light. (0=very dark and 100=very light)– Ambient Light: Measures the strength of the light that enters the
sensor from the environment. (0=very dark and 100=very light)
• USES:– Move until a line– Follow a line
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Color Sensors – reflected light mode…
• The COLOR SENSOR shines a light on the mat and reads the reflected brightness level (intensity) level, i.e. dark or bright, to help the robot recognize its position and through programming take action.
• Light intensity ranges from 0-100% • On a bright (white) area of the mat the light intensity value will be above 50% • On darker area (blue, black, green,…), the light intensity value will be below 50%
• To obtain more accurate reading, make sure the light sensor is close to the mat (less than ½ inch)
• Calibrate the sensor whenever light conditions change (see calibrate slide)
Black Violet
Dark Blue Dark Red / Brown
70%
50%
20%
50%
70%
40
We will use COLOR MODE in this Lesson
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Another Move Steering Tip: Coast or Break?
• Something more about the Move Steering Block
• You will notice you have an option to COAST or BRAKE
• Coast will make the motors keep moving. Brake makes the motors stop immediately.
• Which do you use to stop EXACTLY on a colored line?
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Colour Sensor Challenge■ Make the robot move up
to a green line using the color sensor?
■ Step 1: Use Wait For Colour
■ Step 2: Use the colour sensor in COLOR MODE
■ Step 3: Coast or Brake?
■ Hint: You will use Move Steering (think about motor on and off) and Wait for “Color”
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Colour Sensor Challenge Solution
© EV3Lessons.com, 2016, (Last edit: 7/26/2016)
FINISH
START
Move SteeringSet to “OFF” with BRAKE
Move SteeringSet to “ON”
Wait until Colour is Green (#3)
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Discussion Guide■ Can you look for more than one colour with the colour
sensor?
■ What is the difference between COAST and BRAKE in a Move Steering Block?
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Answer: Yes
Ans. Coast will allow your motors to spin freely after a move, but Brake will Immediately stop it
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CREDITS• This tutorial was created by Sanjay Seshan and Arvind Seshan
• More lessons are available at www.ev3lessons.com
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.