micropython on picoboard while loop not working

Question

from picozero import pico_led, Button, LED, Buzzer
from time import sleep
led16 = LED(16)
button12 = Button(12, pull_up = False)
button15 = Button(15, pull_up = False)
buzzer14 = Buzzer(14)

global cont
cont = True

global count
count = 0


def cont_false():
    global count
    global cont
    if count >= 10:
        cont == False
        print(cont)

def Timer_start():
    led16.on()
    global cont
    global count
    sleep(5)
    while cont:
        buzzer14.toggle()
        sleep(0.2)
        buzzer14.toggle()
        count += 1
        print(count)
        sleep(0.3)

button15.when_pressed = Timer_start

button12.when_pressed = cont_false

while True:
    pico_led.toggle()
    sleep(0.5)

so its meant to be so that cont_false sets cont to false and stops the while loop in Timer_start but it does nothing

The While loop in Timer_start runs once outputting 1 then it keeps beeping but never outputs again

im using micro python on a Raspberry Pi Pico

Answer 1

You're trying to stop the while cont loop in the Timer_start() function when cont_false is triggered. However, the condition cont == False in cont_false() is a comparison, not an assignment, so it doesn't actually change the value of cont.

Additionally, cont_false() only checks count when button12 is pressed, but count will never reach 10 because the function isn't called automatically after each increment.

Fixed code:

from time import sleep

cont = True
count = 0

def cont_false():
    global cont
    cont = False  # Use '=' for assignment instead of '=='
    print("Timer stopped:", cont)

def Timer_start():
    global cont, count
    led16.on()
    cont = True   # Ensure the timer starts fresh each time
    count = 0     # Reset count for each new start

    sleep(5)
    while cont:
        buzzer14.toggle()
        sleep(0.2)
        buzzer14.toggle()
        count += 1
        print("Count:", count)
        sleep(0.3)

        # Check if count exceeds 10 to stop automatically
        if count >= 10:
            cont_false()

button15.when_pressed = Timer_start
button12.when_pressed = cont_false  # Manual stop

while True:
    pico_led.toggle()
    sleep(0.5)

Answer 2

I am not sure that will help but. If it's beeping, your loop is still running for sure. However, What does not loop is your button 2 handler. So in order, to make your loop stop you need to press on button12.

Furthermore, there is a double equal sign (==) at line 19. This can also explain what happens.

I hope it helped !