Embedded Files
Check CircuitPython version
Check CircuitPython version
If you need to verify which version of CircuitPython is running on your board, you can check it through the serial REPL (Read-Evaluate-Print Loop).
Open the Command Palette (Ctrl+Shift+P / Cmd+Shift+P) and select CircuitPython: Open Serial Monitor.
Click inside the terminal window at the bottom of your screen.
Press Ctrl+C on your keyboard. This will interrupt any currently running code and enter the REPL.
The first line printed in the terminal will display the active version (e.g., Adafruit CircuitPython 9.x.x on 2024-xx-xx; Adafruit Metro M0 Express with samd21g18).
To exit the REPL and restart your code, press Ctrl+D.
Hardware Not Responding (Code Running on Computer)
Hardware Not Responding (Code Running on Computer)
You wrote code to interact with the board's hardware, but nothing happens on the board, or you receive an error in VS Code stating that modules like board or simpleio cannot be found.
You may have accidentally run the code on your computer instead of the board
You wrote code to interact with the board's hardware, but nothing happens on the board, or you receive an error in VS Code stating that modules like board or simpleio cannot be found.
You may have accidentally run the code on your computer instead of the board
Do not use the standard Python "Play" button (Run Python File) in the top right corner of VS Code. This attempts to run the code locally on your computer's CPU, which cannot access the microcontroller's hardware or CircuitPython-specific libraries.
To run code on the board: Ensure your file is saved on the CIRCUITPY drive as code.py. Simply saving the file (Ctrl+S / Cmd+S) automatically triggers the board to execute the code. View the results by opening the CircuitPython Serial Monitor.
Serial Monitor Disappeared but Port is "Busy"
Serial Monitor Disappeared but Port is "Busy"
You closed the serial monitor terminal, but when you try to reopen it, VS Code displays a notification that the serial monitor is already open for your COM port. Instead of showing your board's output, a standard PowerShell or command line terminal opens.
You closed the serial monitor terminal, but when you try to reopen it, VS Code displays a notification that the serial monitor is already open for your COM port. Instead of showing your board's output, a standard PowerShell or command line terminal opens.
The CircuitPython extension still holds the serial connection in the background and must be explicitly told to release it.
The CircuitPython extension still holds the serial connection in the background and must be explicitly told to release it.
Open the Command Palette (Ctrl+Shift+P / Cmd+Shift+P).
Type CircuitPython and select CircuitPython: Close Serial Monitor from the list.
Open the Command Palette again and select CircuitPython: Open Serial Monitor to establish a fresh connection.
Alternative Fix: If the port remains stuck after attempting the steps above, you can force VS Code to reset. Open the Command Palette, type Reload, and select Developer: Reload Window. Once the application refreshes, try opening the serial monitor again.
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