Introduction
============
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:target: https://adafru.it/discord
:alt: Discord
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:alt: Build Status
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:alt: Code Style: Black
=================================
CircuitPython library for control of LTC1665 8-bit and LTC1660 10-bit 8 channel DACs from Linear Technologies.
`LTC166X datasheet <https://www.analog.com/media/en/technical-documentation/data-sheets/166560fa.pdf>`_
Multiple LTC1665/LTC1660’s can be controlled from a single 3-wire serial port (i.e., SCK, DIN and CS/LD) by
using the included “daisy-chain” facility. A series of *n* chips is configured by connecting each DOUT (except the
last) to DIN of the next chip, forming a single 16n-bit shift register. The SCK and CS/LD signals are common
to all chips in the chain. In use, CS/LD is held low while *n* 16-bit words are clocked to DIN of the first chip; CS/LD
is then pulled high, updating all of them simultaneously.
Dependencies
=============
This driver depends on:
* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
* `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_
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>`_
or individual libraries can be installed using
`circup <https://github.com/adafruit/circup>`_.
Installing from PyPI
=====================
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
PyPI <https://pypi.org/project/creativecontrol-circuitpython-ltc166x/>`_.
To install for current user:
.. code-block:: shell
pip3 install creativecontrol-circuitpython-ltc166x
To install system-wide (this may be required in some cases):
.. code-block:: shell
sudo pip3 install creativecontrol-circuitpython-ltc166x
To install in a virtual environment in your current project:
.. code-block:: shell
mkdir project-name && cd project-name
python3 -m venv .venv
source .env/bin/activate
pip3 install creativecontrol-circuitpython-ltc166x
Installing to a Connected CircuitPython Device with Circup
==========================================================
Make sure that you have ``circup`` installed in your Python environment.
Install it with the following command if necessary:
.. code-block:: shell
pip3 install circup
With ``circup`` installed and your CircuitPython device connected use the
following command to install:
.. code-block:: shell
circup install creativecontrol_circuitpython_ltc166x
Or the following command to update an existing version:
.. code-block:: shell
circup update
Usage Example
=============
.. code-block:: shell
import time
import board
import creativecontrol_circuitpython_ltc166x
ltc1665 = creativecontrol_circuitpython_ltc166x.LTC1665(csel=board.GP1, sck=board.GP2, mosi=board.GP3, debug=True)
dac_values = [1, 3, 7, 15, 31, 63, 127, 255]
while True:
print('writing dac values ', time.monotonic())
ltc1665.write_dac_values(dac_values)
time.sleep(4)
print('off')
ltc1665.write_dac_values([0]*8)
time.sleep(4)
Documentation
=============
API documentation for this library can be found on `Read the Docs <https://creativecontrol-circuitpython-ltc166x.readthedocs.io/>`_.
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>`_.
Tutorial
=============
A tutorial on controlling daisy-chained LTC166X DACs can be found on my website `creativecontrol <https://www.creativecontrol.cc/blog/2023/7/7/circuitpython-ltc166x-dac-control-of-daisy-chained-dacs>`_.
Contributing
============
Contributions are welcome! Please read our `Code of Conduct
<https://github.com/creativecontrol/CircuitPython_creativecontrol_CircuitPython_LTC166X/blob/HEAD/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.
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