Learn CIRCUITPYTHON with Real Code Examples
Updated Nov 21, 2025
Installation Setup
Install CircuitPython firmware on a supported microcontroller
Connect the board via USB to a computer
The board appears as a USB drive
Copy or edit code.py directly on the board
Install additional CircuitPython libraries as needed
Environment Setup
Install CircuitPython firmware
Connect board via USB
Ensure compatible libraries are in lib/
Write code.py for project logic
Test peripherals and iterate scripts
Config Files
code.py - main script
boot.py - optional boot configuration
lib/ - hardware libraries
data/ - files and logs
assets/ - images, fonts, or media files
Cli Commands
Copy code.py to board USB drive
Use REPL: screen /dev/ttyUSB0 115200
Update libraries in lib/ folder
Reset board to rerun code.py
Monitor serial output for debugging
Internationalization
Supports UTF-8 for string handling
No built-in localization for hardware messages
Community resources may provide translations
Works globally on supported boards
Documentation often in English
Accessibility
Easy-to-read Python syntax
REPL for interactive experimentation
USB drive editing supports all major OS
Libraries simplify hardware interactions
Educational materials widely available
Ui Styling
LEDs, displays, and buttons as primary interfaces
No native graphical UI
Dashboards possible via connected PC or web interface
Visual feedback through NeoPixels or OLED screens
Focus on simplicity and interactivity
State Management
Variables in code.py store current device state
Sensor readings updated in loops
Actuator outputs reflect script logic
REPL can inspect and modify state
Persistent data stored in files if needed
Data Management
Raw sensor values read via pins
Processed in code.py for control decisions
Optional logging in onboard storage
Data transmitted via Wi-Fi/Ethernet if available
Memory management critical for small boards