So, today I’m still waiting for the Pico, so I’m still using Wokwi, and the PDF book, to learn, and practice. Today I’ve made a traffic light, which is working by continuously alternating red, yellow and green lights. It worked just fine, until I added a feature, so when a “pedestrian” pushes a button, a buzzer makes 10 beeps, and the light switches to red for the “cars”. This seemed to be too much for Wokwi, and it kind of crashed, so I relied on the PDF book, to verify the code, and the wiring.