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https://github.com/adafruit/adafruit_circuitpython_ds1307

CircuitPython drivers for the DS1307 realtime clock.
https://github.com/adafruit/adafruit_circuitpython_ds1307

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CircuitPython drivers for the DS1307 realtime clock.

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README 

        

Introduction

============



.. image:: https://readthedocs.org/projects/adafruit-circuitpython-ds1307/badge/?version=latest

    :target: https://docs.circuitpython.org/projects/ds1307/en/latest/

    :alt: Documentation Status



.. image:: https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_Bundle/main/badges/adafruit_discord.svg

    :target: https://adafru.it/discord

    :alt: Discord



.. image:: https://github.com/adafruit/Adafruit_CircuitPython_DS1307/workflows/Build%20CI/badge.svg

    :target: https://github.com/adafruit/Adafruit_CircuitPython_DS1307/actions/

    :alt: Build Status



.. image:: https://img.shields.io/badge/code%20style-black-000000.svg

    :target: https://github.com/psf/black

    :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. The DS1307 is the most popular

RTC - but it requires 5V power to work.



The DS1307 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 `_.

If you do not need a DS1307, or you need a 3.3V-power/logic capable RTC

please check out our affordable

`PCF8523 RTC breakout `_.



.. image:: ../docs/_static/3296-00.jpg

    :alt: DS1307



Dependencies

=============

This driver depends on:



* `Adafruit CircuitPython `_

* `Bus Device `_

* `Register `_



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:



.. code-block:: shell



    pip3 install adafruit-circuitpython-ds1307



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



.. code-block:: shell



    sudo pip3 install adafruit-circuitpython-ds1307



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-ds1307



Usage Notes

===========



Of course, you must import the library to use it:



.. code:: python3



    import board

    import adafruit_ds1307

    import time



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:: python



    import board



Now, to initialize the I2C bus:



.. code:: python



    i2c = board.I2C()



Once you have created the I2C interface object, you can use it to instantiate

the RTC object:



.. code:: python



    rtc = adafruit_ds1307.DS1307(i2c)



To set the time, you need to set ``datetime`` to a `time.struct_time` object:



.. code:: python



    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:: python



    t = rtc.datetime

    print(t)

    print(t.tm_hour, t.tm_min)



Documentation

=============



API documentation for this library can be found on `Read the Docs `_.



For information on building library documentation, please check out `this guide `_.



Contributing

============



Contributions are welcome! Please read our `Code of Conduct

`_

before contributing to help this project stay welcoming.