Ciro Santilli @cirosantilli 37

The hello world is with a potentiometer: extremes on GND and VCC pins of the Pi, and middle output on pin GIO26, then as you turn the knob, the uart value goes from about 0 to about 64k.

The 0 side is quite noisy and varies between 0 and 300 for some reason.

In Ciro's ASCII art circuit diagram notation:

RPI_PICO_W__gnd__gpio26Adc__3.3V@36
            |    |          |
            |    |          |
            |  +-+          |
            |  |            |
            |  |  +---------+ 
            |  |  |
         P__1__2__3

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micropython/blink_gpio.py by

Ciro Santilli 37 2025-07-27

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Toggle pin 0 twice per second. This could be used for example to blink LED on pin 0 once per second with this test circuit:

BOARD__1gp0____3gnd
       |       |
       R_2k    |
       |       |
       +-aLEDc-+

Tested on:

RPI Pico W

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MicroPython example by

Ciro Santilli 37 2025-07-27

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Under: micropython

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Run MicroPython on X by

Ciro Santilli 37 2025-07-27

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Zephyr official example by

Ciro Santilli 37 2025-07-27

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zephyr/blink_gpio.c by

Ciro Santilli 37 2025-07-27

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Same behavior as micropython/blink_gpio.py.

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Zephyr non-official example by

Ciro Santilli 37 2025-07-27

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Run MicroPython on Micro Bit by

Ciro Santilli 37 2025-07-27

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Bibliography:

tech.microbit.org/software/micropython/

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Run Zephyr on Micro Bit by

Ciro Santilli 37 2025-07-27

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Docs: docs.zephyrproject.org/2.7.0/boards/arm/bbc_microbit/doc/index.html

Build worked:

west build -d build/microbit/hello_world -b bbc_microbit samples/hello_world

but flash failed:

west flash -d build/microbit/hello_world

The build also generates a .hex file by default, and we've tried to flash it manually with:

cp build/microbit/hello_world/zephyr/zephyr.hex /media/ciro/MICROBIT/

but we failed to see it do anything with zephyr/blink_gpio.c, so not sure if the flashing was broken or if the code was broken, or if we didn't find the IO pins correctly.

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