Featured Articles
Announcing Pi
Technical Specifications
Raspberry Pi FAQs
Win a Pi
Raspberry Pi Wishlist
Actions
Forum Thread Details
  • State Suggested Answer
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 663 subscribers
  • Views 441 views
  • Users 0 members are here
Related

Back again with button problem

rcayot

Well, I got my traffic light model working well with help from this forum.  Now I am trying something a little bit different.  I have several scripts that flash a set of LEDs with different patterns.what I would like to do is use a single button to switch between patterns.

 

i have the callback function working, but even if I record and increment button pushes, I don't seem to be able to use an additional button push to jump to the next block.

 

if anyone knows of an example, please point me to it.  Or, if straight forward, please post.

 

roger

  • 0

    Use the button to increment a counter.

    Use If statements to execute different routines for each count value.

  • 0

    okay, got it done.  simplified two patterns, and focused on the loops.  really had to trial and error this one, but I AM persistent.

     

    Roger

     

    import RPi.GPIO as GPIO
from gpiozero import Button, LED, Buzzer
from time import sleep
from signal import pause


red1 = LED(25)
red2 = LED(6)
yel1 = LED(12)
yel2 = LED(19)
grn1 = LED(20)
grn2 = LED(13)
GPIO.setup(18, GPIO.OUT, initial=GPIO.LOW)  # buzzer
GPIO.setup(26, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_UP)
global ontime
global offtime
ontime = [.1, .2, .3, .4, .5]
offtime = [.5, .4, .3, .2, .1]
# Buzz = Buzzer(18)
# btn1 = Button(26)
# btn2 = Button(21)
# ont = 0.2
# offt = 0.2
btncount = "global"
btncount = 0


def btn1(channel):
    global btncount
    btncount += 1
    print(btncount)
    if btncount == 3:
        btncount = 0
    
GPIO.add_event_detect(26, GPIO.FALLING, callback=btn1, bouncetime=300) 


seq = [red1, red2, yel1, yel2, grn1, grn2]


while True:
    if btncount == 0:
        for x in seq:
            x.blink(.1, .1, 3)
            sleep(.2)
            pause
    elif btncount == 1:
            red1.blink(.5, .5)
            sleep(1.1)
            if btncount == 2:
                red1.off()
            pause
    else:
        red2.blink(.5, .5)
        sleep(1.1)
        pause