When you press the a button your terminal session should print an extra line (but serial_test.py could be modified to do this instead). The loop on the Pico in main.py should read it and display it on the LCD. Serial_test.py on the PC should start sending the title of the currently playing media over serial, and also printing it. Stop serial_test.py, open up a terminal to the Pico serial connection and press the a button on the LCD board.Start some compatible media playing, like playing a youtube video in Chrome (anything that populates that Windows 10 media overlay).Update the serial port settings in serial_test.py, start it on your PC and leave it running.Upload main.py and waveshare_lcd.py to your pico and restart it, leaving it connected to the PC.If you have the same Waveshare LCD and a Windows PC you can get an example going quickly: Even with gc.collect() and clean exits everywhere it will hang and cook the USB-to-serial interaction until a hard reboot.Īvoid using the second processor on the Pico in micropython for now. After trying to work with this for a while, it turns out that Micropython doesn’t play well with the second processor on the Pico yet. One of the links above runs the serial buffer on the second processor. Otherwise I’d have to close VSCode every time I wanted to run the serial program on the PC side. I use the ampy CLI tool ( pip install adafruit-ampy) to control it instead because that releases control of the serial port when it’s done.All micropython pico interaction from Thonny, pico-go etc happens via control characters sent via serial.Instead we get the minimum there could be (1) and loop until our polling returns false. there’s no easy micropython way to get all the bytes available from stdin.read().stdin.read() is a blocking call so we use select or poll to only call it when there’s data there.stdin.read() reads input from USB serial, print() writes to it.Hopefully this helps you if you’re looking to do the same or to understand the general concepts and build your own. I ended up breaking them down and combining them to create a simpler foundation for my own use.

I found a few guides around for getting the serial communication going, but none were exactly in the form I needed. Pico-based Waveshare LCD + buttons to a Pi via serial, instead of simply using a Pi hat directly. So when I wanted to add some physical IO to one, I figured it would be much more thematic and fun to connect my

How to use serial port in raspberry pi