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Color sensor readings py v2
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Delete the extra programs
Drive a given path
Ev3-G
Follow a line
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Line follower proportional py v2
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Mahtavaa Matematiikkaa 2020
Main Page
Mechanical
Meet and Code 2020 I: Ev3-G
Meet and Code 2020 II: Python
Ohjauslohko 2 moottoria
Ohjauslohko 4 moottoria
Programming with the buttons
Steer left and right py v2
Stop at given length from the wall
Stop the robot after the third line
The falling tower
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zh-hans - Simplified Chinese
zh-hant - Traditional Chinese
zh-hk - Chinese (Hong Kong)
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zh-sg - Chinese (Singapore)
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<languages /> == Introduction == === Robot === The idea and principle works for almost any robot thought this is tested using Asimov. === Sensors === The color sensor in reflected light intensity mode is used. The sensor convention is #port 1 = touch, #port 2 = gyro, #port 3 = color, #port 4 = infrared or ultrasonic == An Illuminating Example == <youtube>iB2SfWeBkvU</youtube> == Theory == The zigzag line follower actually follows the other side of the line. If the intensity obtained by the sensor is greater than some threshold value (now 50), it will turn right some amount (now 55). Otherwise, if the the intensity is lower the robot turns steering to left (negative value). == An Example Code == <syntaxhighlight lang="python"> #!/usr/bin/env python3 # https://sites.google.com/site/ev3devpython/ #Sensor port convention: #port 3 = color #port 1 = touch, port 2 = gyro, port 3 = color, port 4 = infrared or ultrasonic. #84 is Max #30 is Min from ev3dev2.sensor.lego import ColorSensor from ev3dev2.motor import MoveSteering, OUTPUT_B, OUTPUT_C from time import sleep steer_pair = MoveSteering(OUTPUT_B, OUTPUT_C) steer_pair.on(steering=0, speed=10) cl = ColorSensor() while True: if cl.reflected_light_intensity > 50: steer_pair.on(steering=55, speed=10) else: steer_pair.on(steering=-55, speed=10) steer_pair.off() sleep(5) </syntaxhighlight > <youtube>jU2YQIlBGFY</youtube> == Exercises == 1. It is difficult to debug the robot as it is silent. Let it say if it is in dark or light area. Use [https://python-ev3dev.readthedocs.io/en/ev3dev-stretch/sensors.html#color-sensor Sound.speak('White').wait()] command or e.g. sound.beep() command. Sound is imported using import Sound command. 2. Make the robot move faster. Note that you need to change the parameters according to your line to follow (and robot). Generally, it is advised to change only one value at time. Time your original time and try to make it half. 3. Let the robot use the other side of the line. 4. Now the while loop is forever. Make the robot stop when the right has turned 3.4 revolutions. See [https://sites.google.com/site/ev3devpython/learn_ev3_python/using-motors ev3 Python] for help. 5. Let the robot end when it encounters a silver tape (highly shiny). 6. The Rescue is robot game such that it needs to follow the dashed line. So, make a line with a segment missing, but make your robot to still overlap the missing segment and follow the line on the other side of the missing segment. [[Category: Python v2]] [[Category: Line follower]] [[Category: Color sensor py v2]] [[Category: Asimov]] == About == This course is supported by [https://meet-and-code.org/ Meet and Code]. The course is made in collaboration with [http://www.fllsuomi.org/ Robotiikka- ja tiedekasvatus ry]. [[File:MeetAndcodeLogo.png|thumb]] [[Meet_and_Code_2020_II:_Python | Meet and Code II: Python]]
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