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CircuitPython

CircuitPython is Adafruit's version of Python for microcontrollers. This file is a starting point for coding agents: where the documentation, guides, libraries and board information live.

For agents: CircuitPython docs: Adafruit's Python for microcontrollers, with core API reference, guides, libraries and board information for coding agents.

circuitpythonpython microcontrollersapi referenceadafruit boardsembedded programming

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T14:25:07.242Z. Cached copy · Source on circuitpython.org

# CircuitPython

> CircuitPython is Adafruit's version of Python for microcontrollers. This file is a starting point for coding agents: where the documentation, guides, libraries and board information live.

## Documentation

- [Core API index](https://docs.circuitpython.org/en/latest/llms.txt): every page of the core documentation with a one-line summary, generated on each docs build
- [Core documentation](https://docs.circuitpython.org/en/stable/): request any page with `Accept: text/markdown` to get Markdown instead of HTML
- [Learn guides](https://learn.adafruit.com/llms.txt): the Adafruit Learning System index; add `.md` to a guide URL for Markdown, `?view=all` for the whole guide in one response

## Boards and libraries

- [Downloads](https://circuitpython.org/downloads): firmware for each board; a board's page, `https://circuitpython.org/board/<board_id>/`, lists the modules built into its firmware
- [Libraries](https://circuitpython.org/libraries): the Adafruit and Community bundles; use the bundle that matches the firmware's major version, since `.mpy` files are version-specific
- [Library documentation](https://docs.circuitpython.org/projects/bundle/en/latest/drivers.html): Adafruit publishes a CircuitPython driver for most of its breakouts

## Common pitfalls

- A board's built-in display is `supervisor.runtime.display`; not every board has `board.DISPLAY`, and it is `None` when there is no display. Reuse it rather than releasing it and building a new one; on DVI boards its size comes from `CIRCUITPY_DISPLAY_WIDTH`, `_HEIGHT` and `_COLOR_DEPTH` in `settings.toml`. [supervisor](https://docs.circuitpython.org/en/latest/shared-bindings/supervisor/index.html)
- To tell a power-on or reset from a reload, check `supervisor.runtime.run_reason == supervisor.RunReason.STARTUP`; saving `code.py` or pressing Ctrl-D also restarts the program. [supervisor](https://docs.circuitpython.org/en/latest/shared-bindings/supervisor/index.html)
- To pace an animation, set `display.auto_refresh = False` and call `display.refresh(target_frames_per_second=N)`. Without a target, `refresh()` returns at once, so counting loop iterations does not count frames. [framebufferio](https://docs.circuitpython.org/en/latest/shared-bindings/framebufferio/index.html)
- `time.monotonic()` is a float that keeps millisecond precision only for about the first hour after start-up; use `time.monotonic_ns()` to measure short intervals. [time](https://docs.circuitpython.org/en/latest/shared-bindings/time/index.html)
- Show a group with `display.root_group = group`; `display.show()` was removed in CircuitPython 9. Text on a display comes from the `adafruit_display_text` library (`from adafruit_display_text import label`, then `label.Label(terminalio.FONT, text=...)`); `displayio` itself has no text class. [displayio](https://docs.circuitpython.org/en/latest/shared-bindings/displayio/index.html)
- CircuitPython is not CPython: there is no `os.path`, no `json.JSONDecodeError` (bad JSON
…

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