Ciro Santilli @cirosantilli 37

Toggle GPIO pin 0 on and off twice a second. Also toggle the on-board LED and print to UART for correlation. You can see this in action e.g. by linking an LED between pin 0 and one of the GND pins of the Pi, and the LED will blink. Circuit:

RPI_PICO_W__1gp0____3gnd
            |       |
            R_2k    |
            |       |
            +-aLEDc-+

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:

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:and a counter shows up there just fine!