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_posts/2011-07-25-wwvbpy-WWVB-timecode-generator-in-python.html
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_posts/2011-07-25-wwvbpy-WWVB-timecode-generator-in-python.html
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---
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layout: default
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title: "wwvbpy: WWVB timecode generator in python"
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redirect_from:
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- /01311601289
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---
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<title>wwvbpy: WWVB timecode generator in python</title>
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<script type="text/javascript" src="https://media.unpythonic.net/js/jquery-1.6.4.min.js"></script>
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border: 1px solid black;
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padding: 2px;
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div.floatimageright { clear: right; float: right; }
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padding: 4px;
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vertical-align: baseline;
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text-decoration: none !important;
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.album { display: block; clear: both; }
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}
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--></style>
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<!-- no summary found -->
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</head>
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<body>
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<div style="float:right;clear:right"><!-- timecode.png--><div class=albumouter style=width:306px id=><div class=albumimage style="width:306px;margin-left:0px;"><a href="https://media.unpythonic.net/emergent-files/01311601289/timecode.png" class="thickbox" rel="album" title="Timecode for the 1998 leap second"><img src="https://media.unpythonic.net/emergent-files/01311601289/timecode-small.jpg" width=300 height=72></a><div ><div style="float: right" ><a href="https://media.unpythonic.net/emergent-files/01311601289/timecode.png"><img class=zoom src="https://media.unpythonic.net/emergent-files/default/zoom.png"></a></div><a href="https://media.unpythonic.net/emergent-files/01311601289/timecode.png">Timecode for the 1998 leap second</a></div></div></div>
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</div>
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A few weeks ago, I posted about a <a href="https://gamma.unpythonic.net/01308865139">WWVB timecode
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generator written in C</a>. Unfortunately, this timecode generator did not
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have a clear license permitting modification or redistribution, so I
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felt I was unable to incorporate it into a project of my own.
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<p>Thus was born my own timecode generator, called wwvbpy. Its primary
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output mode is compatible with the "wwvb2.c" that inspired it. It also
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has a few features that wwvb2.c didn't: automatic handling of DST, DUT1,
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and leap seconds. DST is handled according to the operating system's
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rules for Denver. DUT1 and leap seconds are handled using data from
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IERS (As a result, my program's DUT1 does not exactly match past
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broadcast data on WWVB, as the data NIST broadcasts is "an average value
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for an extended range of dates").
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<p>It also has a set of tests of interesting times, such as the first and
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second days after a DST change, the last and last-but-one days of leap
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and non-leap years, a historical leap second, etc. (where possible,
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these test vectors were originally generated by wwvb2; however, some of
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the tests—such as the DST tests—had to be hand-generated, as wwvb2
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couldn't generate them; besides this limitation, I also uncovered a bug
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in wwvb2 where non-leap years were treated as having 364 days and
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leap-years were treated as having 365!)
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<p>An option to output the timecode data to a serial device is contemplated
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but not finished; ultimately, this would work together with an
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Arduino/AVR firmware to produce a logic-level and/or 60kHz modulated
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version of the signal for testing hardware devices.
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<p>wwvbpy is covered by the GNU GPL v2+. It can be obtained from my public
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git repository: <a href="http://git.unpy.net/view?p=wwvbpy.git;a=summary">http://git.unpy.net/view?p=wwvbpy.git;a=summary</a>.
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<br><br><font size=-2>Entry first conceived on 25 July 2011, 13:41 UTC, last modified on 15 January 2012, 3:46 UTC</font>
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</body>
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</html>
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