Introduction¶

CircuitPython module for the NXP FXOS8700 accelerometer and magnetometer.

Dependencies¶

This driver depends on:

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Usage Example¶

See examples/simpletest.py for a demo of the usage.

Contributing¶

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Building locally¶

To build this library locally you’ll need to install the circuitpython-build-tools package.

python3 -m venv .env
source .env/bin/activate
pip install circuitpython-build-tools

Once installed, make sure you are in the virtual environment:

source .env/bin/activate

Then run the build:

circuitpython-build-bundles --filename_prefix adafruit-circuitpython-fxos8700 --library_location .

Sphinx documentation¶

Sphinx is used to build the documentation based on rST files and comments in the code. First, install dependencies (feel free to reuse the virtual environment from above):

python3 -m venv .env
source .env/bin/activate
pip install Sphinx sphinx-rtd-theme

Now, once you have the virtual environment activated:

cd docs
sphinx-build -E -W -b html . _build/html

This will output the documentation to docs/_build/html. Open the index.html in your browser to view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to locally verify it will pass

Table of Contents¶

Simple test¶

Ensure your device works with this simple test.

examples/fxos8700_simpletest.py¶

# Simple demo of the FXOS8700 accelerometer and magnetometer.
# Will print the acceleration and magnetometer values every second.
import time

import board
import busio

import adafruit_fxos8700


# Initialize I2C bus and device.
i2c = busio.I2C(board.SCL, board.SDA)
sensor = adafruit_fxos8700.FXOS8700(i2c)
# Optionally create the sensor with a different accelerometer range (the
# default is 2G, but you can use 4G or 8G values):
#sensor = adafruit_fxos8700.FXOS8700(i2c, accel_range=adafruit_fxos8700.ACCEL_RANGE_4G)
#sensor = adafruit_fxos8700.FXOS8700(i2c, accel_range=adafruit_fxos8700.ACCEL_RANGE_8G)

# Main loop will read the acceleration and magnetometer values every second
# and print them out.
while True:
    # Read acceleration & magnetometer.
    accel_x, accel_y, accel_z = sensor.accelerometer
    mag_x, mag_y, mag_z = sensor.magnetometer
    # Print values.
    print('Acceleration (m/s^2): ({0:0.3f}, {1:0.3f}, {2:0.3f})'.format(accel_x, accel_y, accel_z))
    print('Magnetometer (uTesla): ({0:0.3f}, {1:0.3f}, {2:0.3f})'.format(mag_x, mag_y, mag_z))
    # Delay for a second.
    time.sleep(1.0)

`adafruit_fxos8700`¶

CircuitPython module for the NXP FXOS8700 accelerometer and magnetometer. Based on the driver from: https://github.com/adafruit/Adafruit_FXOS8700

See examples/simpletest.py for a demo of the usage.

Author(s): Tony DiCola

Implementation Notes¶

Hardware:

Adafruit Precision NXP 9-DOF Breakout Board - FXOS8700 + FXAS21002 (Product ID: 3463)

Software and Dependencies:

Adafruit CircuitPython firmware (2.2.0+) for the ESP8622 and M0-based boards: https://github.com/adafruit/circuitpython/releases
Adafruit’s Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice

class adafruit_fxos8700.FXOS8700(i2c, address=31, accel_range=0)[source]¶

Driver for the NXP FXOS8700 accelerometer and magnetometer.

accelerometer¶: Read the acceleration from the accelerometer and return its X, Y, Z axis values as a 3-tuple in m/s^2.

magnetometer¶: Read the magnetometer values and return its X, Y, Z axis values as a 3-tuple in uTeslas.

read_raw_accel_mag()[source]¶

Read the raw accelerometer and magnetometer readings. Returns a 2-tuple of 3-tuples:

Accelerometer X, Y, Z axis 14-bit signed raw values
Magnetometer X, Y, Z axis 16-bit signed raw values

If you want the acceleration or magnetometer values in friendly units consider using the accelerometer and magnetometer properties!