Introduction to Adafruit's PCF8523 Real Time Clock (RTC) Library
================================================================
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:alt: Code Style: Black
This is a great battery-backed real time clock (RTC) that allows your
microcontroller project to keep track of time even if it is reprogrammed,
or if the power is lost. Perfect for datalogging, clock-building, time
stamping, timers and alarms, etc. Equipped with PCF8523 RTC - it can
run from 3.3V or 5V power & logic!
The PCF8523 is simple and inexpensive but not a high precision device.
It may lose or gain up to two seconds a day. For a high-precision,
temperature compensated alternative, please check out the
`DS3231 precision RTC. <https://www.adafruit.com/products/3013>`_
If you need a DS1307 for compatibility reasons, check out our
`DS1307 RTC breakout <https://www.adafruit.com/products/3296>`_.
.. image:: _static/3295-00.jpg
:alt: PCF8523 Breakout Board
Dependencies
=============
This driver depends on the `Register <https://github.com/adafruit/Adafruit_CircuitPython_Register>`_
and `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_
libraries. Please ensure they are also available on the CircuitPython filesystem.
This is easily achieved by downloading
`a library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.
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-pcf8523/>`_. To install for current user:
.. code-block:: shell
pip3 install adafruit-circuitpython-pcf8523
To install system-wide (this may be required in some cases):
.. code-block:: shell
sudo pip3 install adafruit-circuitpython-pcf8523
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-pcf8523
Usage Notes
===========
Basics
------
Of course, you must import the library to use it:
.. code:: python3
import time
from adafruit_pcf8523.pcf8523 import PCF8523
All the Adafruit RTC libraries take an instantiated and active I2C object
(from the `board` library) as an argument to their constructor. The way to
create an I2C object depends on the board you are using. For boards with labeled
SCL and SDA pins, you can:
.. code:: python3
import board
Now, to initialize the I2C bus:
.. code:: python3
i2c = board.I2C()
Once you have created the I2C interface object, you can use it to instantiate
the RTC object:
.. code:: python3
rtc = PCF8523(i2c)
Date and time
-------------
To set the time, you need to set datetime` to a `time.struct_time` object:
.. code:: python3
rtc.datetime = time.struct_time((2017,1,9,15,6,0,0,9,-1))
After the RTC is set, you retrieve the time by reading the `datetime`
attribute and access the standard attributes of a struct_time such as ``tm_year``,
``tm_hour`` and ``tm_min``.
.. code:: python3
t = rtc.datetime
print(t)
print(t.tm_hour, t.tm_min)
Alarm
-----
To set the time, you need to set `alarm` to a tuple with a `time.struct_time`
object and string representing the frequency such as "hourly":
.. code:: python3
rtc.alarm = (time.struct_time((2017,1,9,15,6,0,0,9,-1)), "daily")
After the RTC is set, you retrieve the alarm status by reading the
`alarm_status` attribute. Once True, set it back to False to reset.
.. code:: python3
if rtc.alarm_status:
print("wake up!")
rtc.alarm_status = False
Documentation
=============
API documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/pcf8523/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_PCF8523/blob/main/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.
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"description": "\nIntroduction to Adafruit's PCF8523 Real Time Clock (RTC) Library\n================================================================\n\n.. image:: https://readthedocs.org/projects/adafruit-circuitpython-pcf8523/badge/?version=latest\n :target: https://docs.circuitpython.org/projects/pcf8523/en/latest/\n :alt: Documentation Status\n\n.. image:: https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_Bundle/main/badges/adafruit_discord.svg\n :target: https://adafru.it/discord\n :alt: Discord\n\n.. image:: https://github.com/adafruit/Adafruit_CircuitPython_PCF8523/workflows/Build%20CI/badge.svg\n :target: https://github.com/adafruit/Adafruit_CircuitPython_PCF8523/actions/\n :alt: Build Status\n\n.. image:: https://img.shields.io/badge/code%20style-black-000000.svg\n :target: https://github.com/psf/black\n :alt: Code Style: Black\n\nThis is a great battery-backed real time clock (RTC) that allows your\nmicrocontroller project to keep track of time even if it is reprogrammed,\nor if the power is lost. Perfect for datalogging, clock-building, time\nstamping, timers and alarms, etc. Equipped with PCF8523 RTC - it can\nrun from 3.3V or 5V power & logic!\n\nThe PCF8523 is simple and inexpensive but not a high precision device.\nIt may lose or gain up to two seconds a day. For a high-precision,\ntemperature compensated alternative, please check out the\n`DS3231 precision RTC. <https://www.adafruit.com/products/3013>`_\nIf you need a DS1307 for compatibility reasons, check out our\n`DS1307 RTC breakout <https://www.adafruit.com/products/3296>`_.\n\n.. image:: _static/3295-00.jpg\n :alt: PCF8523 Breakout Board\n\nDependencies\n=============\n\nThis driver depends on the `Register <https://github.com/adafruit/Adafruit_CircuitPython_Register>`_\nand `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_\nlibraries. Please ensure they are also available on the CircuitPython filesystem.\nThis is easily achieved by downloading\n`a library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.\n\nInstalling from PyPI\n====================\nOn supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from\nPyPI <https://pypi.org/project/adafruit-circuitpython-pcf8523/>`_. To install for current user:\n\n.. code-block:: shell\n\n pip3 install adafruit-circuitpython-pcf8523\n\nTo install system-wide (this may be required in some cases):\n\n.. code-block:: shell\n\n sudo pip3 install adafruit-circuitpython-pcf8523\n\nTo install in a virtual environment in your current project:\n\n.. code-block:: shell\n\n mkdir project-name && cd project-name\n python3 -m venv .venv\n source .venv/bin/activate\n pip3 install adafruit-circuitpython-pcf8523\n\n\nUsage Notes\n===========\n\nBasics\n------\n\nOf course, you must import the library to use it:\n\n.. code:: python3\n\n import time\n from adafruit_pcf8523.pcf8523 import PCF8523\n\nAll the Adafruit RTC libraries take an instantiated and active I2C object\n(from the `board` library) as an argument to their constructor. The way to\ncreate an I2C object depends on the board you are using. For boards with labeled\nSCL and SDA pins, you can:\n\n.. code:: python3\n\n import board\n\nNow, to initialize the I2C bus:\n\n.. code:: python3\n\n i2c = board.I2C()\n\nOnce you have created the I2C interface object, you can use it to instantiate\nthe RTC object:\n\n.. code:: python3\n\n rtc = PCF8523(i2c)\n\nDate and time\n-------------\n\nTo set the time, you need to set datetime` to a `time.struct_time` object:\n\n.. code:: python3\n\n rtc.datetime = time.struct_time((2017,1,9,15,6,0,0,9,-1))\n\nAfter the RTC is set, you retrieve the time by reading the `datetime`\nattribute and access the standard attributes of a struct_time such as ``tm_year``,\n``tm_hour`` and ``tm_min``.\n\n.. code:: python3\n\n t = rtc.datetime\n print(t)\n print(t.tm_hour, t.tm_min)\n\nAlarm\n-----\n\nTo set the time, you need to set `alarm` to a tuple with a `time.struct_time`\nobject and string representing the frequency such as \"hourly\":\n\n.. code:: python3\n\n rtc.alarm = (time.struct_time((2017,1,9,15,6,0,0,9,-1)), \"daily\")\n\nAfter the RTC is set, you retrieve the alarm status by reading the\n`alarm_status` attribute. Once True, set it back to False to reset.\n\n.. code:: python3\n\n if rtc.alarm_status:\n print(\"wake up!\")\n rtc.alarm_status = False\n\nDocumentation\n=============\n\nAPI documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/pcf8523/en/latest/>`_.\n\nFor 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>`_.\n\nContributing\n============\n\nContributions are welcome! Please read our `Code of Conduct\n<https://github.com/adafruit/Adafruit_CircuitPython_PCF8523/blob/main/CODE_OF_CONDUCT.md>`_\nbefore contributing to help this project stay welcoming.\n",
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