Introduction

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Adafruit CircuitPython driver for the MLX90393 3-axis 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.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-mlx90939

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-mlx90939

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-mlx90939

Usage Example

import time
import busio
import board

import adafruit_mlx90393

I2C_BUS = busio.I2C(board.SCL, board.SDA)
SENSOR = adafruit_mlx90393.MLX90393(I2C_BUS, gain=adafruit_mlx90393.GAIN_1X)

while True:
    MX, MY, MZ = SENSOR.read_data(delay=1.0, raw=False)
    print("[{}]".format(time.monotonic()))
    print("X: {} uT".format(MX))
    print("Y: {} uT".format(MY))
    print("Z: {} uT".format(MZ))
    # Display the status field if an error occured, etc.
    if SENSOR.last_status > adafruit_mlx90393.STATUS_OK:
        SENSOR.display_status()

Contributing

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

Building locally

Zip release files

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_mlx90393 --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/adafruit_mlx90393_simpletest.py
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import time
import busio
import board

import adafruit_mlx90393

I2C_BUS = busio.I2C(board.SCL, board.SDA)
SENSOR = adafruit_mlx90393.MLX90393(I2C_BUS, gain=adafruit_mlx90393.GAIN_1X)

while True:
    MX, MY, MZ = SENSOR.read_data(delay=1.0, raw=False)
    print("[{}]".format(time.monotonic()))
    print("X: {} uT".format(MX))
    print("Y: {} uT".format(MY))
    print("Z: {} uT".format(MZ))
    # Display the status field if an error occured, etc.
    if SENSOR.last_status > adafruit_mlx90393.STATUS_OK:
        SENSOR.display_status()

adafruit_mlx90393

This is a breakout for the Adafruit MLX90393 magnetometer sensor breakout.

  • Author(s): ktown

Implementation Notes

Hardware:

Software and Dependencies:

class adafruit_mlx90393.MLX90393(i2c_bus, address=12, gain=7, debug=False)

Driver for the MLX90393 magnetometer. :param i2c_bus: The busio.I2C object to use. This is the only required parameter. :param int address: (optional) The I2C address of the device. :param int gain: (optional) The gain level to apply. :param bool debug: (optional) Enable debug output.

display_status()

Prints out the content of the last status byte in a human-readble format.

gain

Gets the current gain setting for the device.

last_status

Returns the last status byte received from the sensor.

read_data(delay=0.0, raw=False)

Reads a single X/Y/Z sample from the magnetometer.

reset()

Performs a software reset of the sensor.

Indices and tables