questions about python

[Cyborgium]

Hi there,

 

I recently wrote this tiny program just to control a LEDstrip from a raspberry pi with buttons for each color. So far all it can do is light 1 color at the time, when either one of the buttons is pressed. How could I make it so that I can have multiple buttons pressed at the same time? 

 

Another question: How can I make it so that I can use all those different colours? Right now I only know how to have either blue, red, green or all those at the same time.

 

My current code is:

 

import RPi.GPIO as GPIO
import time

 

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17,GPIO.OUT) #port voor rood
GPIO.setup(27,GPIO.OUT) #port voor groen
GPIO.setup(22,GPIO.OUT) #port voor blauw
GPIO.setup(24,GPIO.IN,pull_up_down=GPIO.PUD_UP) #knop voor rood
GPIO.setup(18,GPIO.IN,pull_up_down=GPIO.PUD_UP) #knop voor blauw
GPIO.setup(23,GPIO.IN,pull_up_down=GPIO.PUD_UP) #knop voor groen

while True:
    GPIO.output(22,False)
    GPIO.output(27,False)
    GPIO.output(17,False)
    while GPIO.input(24) == False: #rood
        print("rood aan")
        GPIO.output(17,True)

    while GPIO.input(23) == False: #groen
        print("groen aan")
        GPIO.output(27,True)

    while GPIO.input(18) == False: #blauw
        print("blauw aan")
        GPIO.output(22,True)

[dany_boy]

Eliminate this:

while True:
    GPIO.output(22,False)
    GPIO.output(27,False)
    GPIO.output(17,False)
    while GPIO.input(24) == False: #rood
        print("rood aan")
        GPIO.output(17,True)

    while GPIO.input(23) == False: #groen
        print("groen aan")
        GPIO.output(27,True)

    while GPIO.input(18) == False: #blauw
        print("blauw aan")
        GPIO.output(22,True) 

use if statements instead:

while true:
	if GPIO.input(24) == False:
		print("rood aan")
    	GPIO.output(17,True)
	else:
		GPIO.output(17,True)

repeat for each channel

[Mira Yurizaki]

 

 

55 minutes ago, Cyborgium said:

Hi there,

 

I recently wrote this tiny program just to control a LEDstrip from a raspberry pi with buttons for each color. So far all it can do is light 1 color at the time, when either one of the buttons is pressed. How could I make it so that I can have multiple buttons pressed at the same time? 

Sample each of the buttons in your execution loop and set the LED state based on the state of the button. Assuming sampling the input spits out a 0 or 1 and the output can use a 0 or 1, then I would do the following:

while True:
    red_btn = GPIO.input(24)
    green_btn = GPIO.input(23)
    blue_btn = GPIO.input(18)

    GPIO.output(22, red_btn)
    GPIO.output(27, green_btn)
    GPIO.output(17, blue_btn)

And in fact, you could replace the variable names (red_btn, green_btn, blue_btn) when calling GPIO.output with the sampling function. But Python philosophy discourages that.

 

However, if they strictly take a True/False, then:

while True:
    red_btn = GPIO.input(24) == True
    green_btn = GPIO.input(23) == True
    blue_btn = GPIO.input(18) == True
    
    GPIO.output(22, red_btn)
    GPIO.output(27, green_btn)
    GPIO.output(17, blue_btn)

EDIT: Thanks to Python's loose typing, True = 1 and False = 0, but nothing else. So 0 or 1 should work with those functions.

[Cyborgium]

1 hour ago, dany_boy said:

Eliminate this:

while True:
    GPIO.output(22,False)
    GPIO.output(27,False)
    GPIO.output(17,False)
    while GPIO.input(24) == False: #rood
        print("rood aan")
        GPIO.output(17,True)

    while GPIO.input(23) == False: #groen
        print("groen aan")
        GPIO.output(27,True)

    while GPIO.input(18) == False: #blauw
        print("blauw aan")
        GPIO.output(22,True) 

use if statements instead:

while true:
	if GPIO.input(24) == False:
		print("rood aan")
    	GPIO.output(17,True)
	else:
		GPIO.output(17,True)

repeat for each channel

I tried the if statements instead and it worked, thanks!