New to micropython and new to Pico. Need some help.

[keswitzer1]

I have written some simple code in Thonny to control stepper and DC motors with a Pico W. My programs were working fin until yesterday when, suddenly, I started getting this error with all my programs:

I even tried this old snippet from a youtube tutorial video. It worked a few weeks ago when I copied it, but even this is erroring out.

from machine import Pin
from time import sleep
myLED=Pin('LED',Pin.OUT)
while True:
    myLED.value(1)
    sleep(1)
    myLED.value(0)
    sleep(1)
It does execute the code, so the LED is flashing, but other code I'm trying to run will not execute.

Any ideas? I'm very frustrated.

[sophiedegran]

Hi keswi
So the code above is ok and the led is flashing.. what other code will not execute ? and what micropython image are you using?

[keswitzer1]

Sorry, I thought I highlighted that code properly. I'm using micropython v1.21.0 (2023-10-06). Yes, the code runs and the LED is flashing, but I don't understand the ambiguous traceback error. I'm not manually interrupting the program and the syntax is fine, so it seems to me I shouldn't see any Traceback message.

An example of other code that is not executing properly not be executing was like this:

from machine import Pin, PWM
from time import sleep

RPM=2900

sleep(.0001)    
duty= int((float(RPM)+3908.7)/.3406)
print(duty)
Brush=PWM(Pin(17))
Brush.freq(1000)
while True: 
    Brush.duty_u16(duty)

and the error reads:

Line 12 is the last line of this code.

In the meantime, I have recreated the errors using a different Pico W on a different computer. Is it possible these errors are always happening and I didn't notice them right away?

Another maybe important point is that the error message flashes by quickly when I restart the program without stopping it. I'm thinking now that the code is running ok. I re-run the program and the restart causes the interrupt error.

This is supported by the fact that when I'm now watching carefully, the Traceback error doesn't occur when I run it from a full stop.

I may have just answered my own question, and the code works but my stepper and DC motors are offline for a different reason.

Thanks.

[sophiedegran]

As you're under thonny to see these msg it can be thonny who see 'KeyboardInterrupt ', had a try and except which write error in file.. but I think you're good ;)