Introduction
============

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I2C Logarithmic Resistor


Dependencies
=============
This driver depends on:

* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
* `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_
* `Register <https://github.com/adafruit/Adafruit_CircuitPython_Register>`_

Please ensure all dependencies are available on the CircuitPython filesystem.
This is easily achieved by downloading
`the Adafruit library and driver bundle <https://circuitpython.org/libraries>`_.

Installing from PyPI
=====================
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
PyPI <https://pypi.org/project/adafruit-circuitpython-ds1841/>`_. To install for current user:

.. code-block:: shell

    pip3 install adafruit-circuitpython-ds1841

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

.. code-block:: shell

    sudo pip3 install adafruit-circuitpython-ds1841

To install in a virtual environment in your current project:

.. code-block:: shell

    mkdir project-name && cd project-name
    python3 -m venv .env
    source .env/bin/activate
    pip3 install adafruit-circuitpython-ds1841

Usage Example
=============

.. code-block:: python

    from time import sleep
    import board
    import busio
    import adafruit_ds1841
    from analogio import AnalogIn

    ####### NOTE ################
    # this example will not work with Blinka/rasberry Pi due to the lack of analog pins.
    # Blinka and Raspberry Pi users should run the "ds1841_blinka_simpletest.py" example

    i2c = busio.I2C(board.SCL, board.SDA)
    ds1841 = adafruit_ds1841.DS1841(i2c)
    wiper_output = AnalogIn(board.A0)

    while True:

        ds1841.wiper = 127
        print("Wiper set to %d"%ds1841.wiper)
        voltage = wiper_output.value
        voltage *= 3.3
        voltage /= 65535
        print("Wiper voltage: %.2f"%voltage)
        print("")
        sleep(1.0)

        ds1841.wiper = 0
        print("Wiper set to %d"%ds1841.wiper)
        voltage = wiper_output.value
        voltage *= 3.3
        voltage /= 65535
        print("Wiper voltage: %.2f"%voltage)
        print("")
        sleep(1.0)

        ds1841.wiper = 63
        print("Wiper set to %d"%ds1841.wiper)
        voltage = wiper_output.value
        voltage *= 3.3
        voltage /= 65535
        print("Wiper voltage: %.2f"%voltage)
        print("")
        sleep(1.0)


Contributing
============

Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_DS1841/blob/master/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.

Documentation
=============

For information on building library documentation, please check out `this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>`_.