View source for Color sensor readings py v2/fi

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== Johdanto ==

Jotta saat kaiken hyödyn antureistasi, ne täytyy tuntea. Tässä esimerkissä testataan lukemia erilaisilla pinnoilla ja materiaaleilla.

=== Robotti ===

Ideat ja periaatteet toimivat lähes kaikille roboteille, mutta tämä on testattu Asimovilla.

=== Anturit ===

Värianturia käytetään ''reflected light intensity'' -moodissa, eli heijastuneen valon tilassa.

== Esimerkki ==


== Theory ==

To read the sensor is easy, but printing the value on a screen with a large enough font is intresting. Note that the print() -command works exactly as Python's print. There is a possibility to use Ev3-G like display command. It is shown elsewhere.

== 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.

from ev3dev2.sensor.lego import ColorSensor

from time import sleep
import os

os.system('setfont Lat15-TerminusBold14')  #Too small for my eyes!
os.system('setfont Lat15-TerminusBold32x16')  # Try this larger font
cl = ColorSensor() 

cl.calibrate_white()

while True:
    print(cl.reflected_light_intensity) 
    sleep(1)

#84 is Max
#30 is Min
</syntaxhighlight>
<youtube>sm06GNCaAF4</youtube>

== Exercises ==

1. Make a table of the reflectance of different colors and materials.


[[Category: Python v2]]
[[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]]