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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Program the Micro Bit with X by

Ciro Santilli 37 2025-07-27

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Microcontroller devboard by

Ciro Santilli 37 2025-07-27

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rpi-pico-w/upython/uart.py by

Ciro Santilli 37 2025-07-26

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Any print() command ends up on the USB, and is shown on the computer via programs such as ampy get back.

However, you can also send data over actual UART.

We managed to get it working based on: timhanewich.medium.com/using-uart-between-a-raspberry-pi-pico-and-raspberry-pi-3b-raspbian-71095d1b259f with the help of a DSD TECH USB to TTL Serial Converter CP2102 just as shown at: stackoverflow.com/questions/16040128/hook-up-raspberry-pi-via-ethernet-to-laptop-without-router/39086537#39086537 for the RPI.

We connect Pin 0 (TX), Pin 1 (RX) and Pin 2 (GND) to the DSD TECH, and the USB to the Ubuntu 25.04 host laptop.

Then on the host laptop I run:

screen /dev/ttyUSB0 9600

and a counter shows up there just fine!

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rpi-pico-w/upython/blink_gpio.py by

Ciro Santilli 37 Created 2025-07-26 Updated 2025-07-27

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Same as the more generic micropython/blink_gpio.py but with the onboard LED added.

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rpi-pico-w/upython/blink.py by

Ciro Santilli 37 2025-07-26

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Blink on-board LED. Note that they broke the LED hello world compatibility from non-W to W for God's sake!!!

The MicroPython code needs to be changed from the Raspberry Pi Pico 1, forums.raspberrypi.com/viewtopic.php?p=2016234#p2016234 comments:

Unlike the original Raspberry Pi Pico, the on-board LED on Pico W is not connected to a pin on RP2040, but instead to a GPIO pin on the wireless chip.

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Program Raspberry Pi Pico W with X by

Ciro Santilli 37 2025-07-26

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