EventFailedScheduleQueueFull in "/lib/picozero/picozero.py", line 1632, in _pin_change

[ericterpstra]

Describe the bug

I'm trying to use the picozero library. The most simple, basic code given in the docs is not working. The error message received is:

Traceback (most recent call last):
  File "/lib/picozero/picozero.py", line 1632, in _pin_change
EventFailedScheduleQueueFull: Button (pin 13) - led_on_off not run due to the micropython schedule being full

To Reproduce

I attached a simple pushbutton to PIN 13 and GND. I also tried PIN 18 and a different GND. Same results no matter which pin is used. I was not pressing the button in rapid succession. In fact, pressing the button, then waiting several seconds, then pressing again yielded the same error.

I tried these examples from the picozero docs:

from picozero import Button, pico_led
from time import sleep

button = Button(13)

def led_on_off():
    pico_led.on()
    sleep(1)
    pico_led.off()
    sleep(1)
    
button.when_pressed = led_on_off

Also

from picozero import Button, pico_led

button = Button(13)

button.when_pressed = pico_led.on
button.when_released = pico_led.off

Both of these examples cause the error mentioned above most of the times the button is pushed. Once in a while (maybe 1 out of 10 or 15 attempts), the intended behavior occurs.

Expected behaviour

This code (without the use of picozero) works as expected:

from machine import Pin
import time

button = Pin(13, Pin.IN, Pin.PULL_UP)
led = Pin("LED", Pin.OUT)

while True:
    if button.value() == 0:
        led.value(1)
    else:
        led.value(0)
    time.sleep(0.1)

System information:

• OS: Raspberry Pi Pico W with Micropython 1.24.1
• Development environment: Both Thonny and VSCode + MicroPython extension.
• picozero version: 0.4.1

[scruss]

There's some discussion here on the forum: EventFailedScheduleQueueFull on simple Button press with picozero - Raspberry Pi Forums

While I can't personally replicate the error, it's not working as it should for the OP