circuitpython-adxl36x

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CircuitPython driver for the Analog Devices ADXL366 and ADXL367 ultra-low-power 3-axis MEMS accelerometers.

ADXL367 implements the full shared register map and is the base class. ADXL366 subclasses it, adding the pedometer, Z-axis nonlinearity compensation, and activity/inactivity reference readback - the three features the ADXL367 silicon doesn't implement. Both support SPI and I2C.

Relationship to adafruit_adxl34x

This library's public API deliberately mirrors the shape of Adafruit's adafruit_adxl34x driver for the ADXL34x family (.acceleration, .events, enable_tap_detection(), enable_motion_detection(), data_rate) so that code written against a 34x-family chip needs minimal changes to run against a 366/367. The two chip families are not register-compatible — only the driver's Python API shape is shared. Notable differences:

  • range is named g_range here instead — range shadows the Python builtin, and compatibility with the ADXL34x API takes a back seat to that on this one property.
  • No enable_freefall_detection() — the 366/367 has no freefall-detection hardware.
  • Range tops out at RANGE_8_G — the 366/367 doesn't support ±16g.
  • DataRate only has 6 discrete rates (12.5 Hz-400 Hz) vs. the 34x's 16.
  • .events includes many more keys (FIFO, pedometer, ADC/temperature thresholds) since the 366/367 exposes far more interrupt sources.

Installation

On a CircuitPython board, copy src/adxl36x/ into CIRCUITPY/lib/adxl36x/, along with the adafruit_bus_device bundle library.

For host-side development (type checking, tests) in another project:

uv add --editable ~/src/circuitpython-adxl36x

Development

uv sync
uv run ruff check --fix
uv run ruff format
uv run ty check
uv run pytest

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Credits

Author: Mike Mabey

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License expression

MIT
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Requires

Python >=3.10

Tags

adxl366 adxl367 accelerometer blinka circuitpython hardware i2c micropython spi

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