Introduction
============
.. image:: https://readthedocs.org/projects/adafruit-circuitpython-ds1841/badge/?version=latest
:target: https://docs.circuitpython.org/projects/ds1841/en/latest/
:alt: Documentation Status
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:target: https://adafru.it/discord
:alt: Discord
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:target: https://github.com/adafruit/Adafruit_CircuitPython_DS1841/actions
:alt: Build Status
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:target: https://github.com/psf/black
:alt: Code Style: Black
CircuitPython library for the Maxim DS1841 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 .venv
source .venv/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
# WIRING:
# 1 Wire connecting VCC to RH to make a voltage divider using the
# internal resistor between RH and RW
# 2 Wire connecting RW to A0
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)
Documentation
=============
API documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/ds1841/en/latest/>`_.
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>`_.
Contributing
============
Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_DS1841/blob/main/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.
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