`adafruit_adxl34x`¶

A driver for the ADXL34x 3-axis accelerometer family

Based on drivers by K. Townsend and Tony DiCola

Implementation Notes¶

Hardware: https://www.adafruit.com/product/1231

Software and Dependencies:

class adafruit_adxl34x.ADXL343(i2c, address=83)¶: Stub class for the ADXL343 3-axis accelerometer

class adafruit_adxl34x.ADXL345(i2c, address=83)¶

Driver for the ADXL345 3 axis accelerometer

Parameters:	i2c_bus (I2C) – The I2C bus the ADXL345 is connected to. address – The I2C device address for the sensor. Default is `0x53`.

acceleration¶: The x, y, z acceleration values returned in a 3-tuple in m / s ^ 2.

enable_freefall_detection(*, threshold=10, time=25)¶

Freefall detection parameters:

Parameters:	threshold (int) – The value that acceleration on all axes must be under to register as dropped. The scale factor is 62.5 mg/LSB. time (int) – The amount of time that acceleration on all axes must be less than `threshhold` to register as dropped. The scale factor is 5 ms/LSB. Values between 100 ms and 350 ms (20 to 70) are recommended.

If you wish to set them yourself rather than using the defaults, you must use keyword arguments:

accelerometer.enable_freefall_detection(time=30)

enable_motion_detection(*, threshold=18)¶

The activity detection parameters.

Parameters:	threshold (int) – The value that acceleration on any axis must exceed to register as active. The scale factor is 62.5 mg/LSB.

If you wish to set them yourself rather than using the defaults, you must use keyword arguments:

accelerometer.enable_motion_detection(threshold=20)

enable_tap_detection(*, tap_count=1, threshold=20, duration=50, latency=20, window=255)¶

The tap detection parameters.

Parameters:

tap_count (int) – 1 to detect only single taps, and 2 to detect only double taps.
threshold (int) – A threshold for the tap detection. The scale factor is 62.5 mg/LSB The higher the value the less sensitive the detection.
duration (int) – This caps the duration of the impulse above threshhold. Anything above duration won’t register as a tap. The scale factor is 625 µs/LSB
latency(double tap only) (int) – The length of time after the initial impulse falls below threshold to start the window looking for a second impulse. The scale factor is 1.25 ms/LSB.
window(double tap only) (int) – The length of the window in which to look for a second tap. The scale factor is 1.25 ms/LSB

If you wish to set them yourself rather than using the defaults, you must use keyword arguments:

accelerometer.enable_tap_detection(duration=30, threshold=25)

events¶

events will return a dictionary with a key for each event type that has been enabled. The possible keys are:

Key	Description
`tap`	True if a tap was detected recently. Whether it’s looking for a single or double tap is determined by the tap param of `enable_tap_detection`
`motion`	True if the sensor has seen acceleration above the threshold set with `enable_motion_detection`.
`freefall`	True if the sensor was in freefall. Parameters are set when enabled with `enable_freefall_detection`

class adafruit_adxl34x.DataRate¶

An enum-like class representing the possible data rates. Possible values are

class adafruit_adxl34x.Range¶

An enum-like class representing the possible measurement ranges in +/- G.

Possible values are