problem with scripts in Arduino Lab for MicroPython

Question

I am trying to set up an Arduino Nano ESP32 so that I can code in MicroPython. I successfully installed Arduino Lab for MicroPython and flashed the firmware onto the device, but when I try to run the sample code from the MicroPython Installation Guide, it fails, citing a syntax error. Curiously, it works fine when I run it through the REPL.

After spending a while trying to debug, I found something interesting. The following code yields the error "Traceback (most recent call last): File "<stdin>", line 11 SyntaxError: invalid syntax"

import time

while True:
    print("1")
    time.sleep(1)
    print("2")
    time.sleep(1)
    print("3")
    time.sleep(1)
    print("4")
    time.sleep(1)

However, if I get rid of the last two lines, it works fine. And once again, the full code works fine if I copy-paste into the REPL. What could be going wrong?

Edit: After spending some more time debugging, it looks like the failure is based on the number of characters in the script. Anything more than 128 characters causes it to fail.

Answer 1

Upload the file manually with mpremote or ampy Install mpremote:

pip install mpremote

Upload your script:

mpremote connect /dev/ttyUSB0 fs put yourscript.py
mpremote connect /dev/ttyUSB0 run yourscript.py

This bypasses the Arduino Lab size limit.

Answer 2

It turns out that there was an incompatibility between MacOS and version 1.26.0 of the Arduino Nano ESP32 firmware. I reverted to v1.25.0, and now everything works.