Värianturin lukeminen
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
#!/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
Exercises
1. Make a table of the reflectance of different colors and materials.
About
This course is supported by Meet and Code. The course is made in collaboration with Robotiikka- ja tiedekasvatus ry.
