Is used for 4-digit 7-SEG module with TM1637 chip
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Expanded the number of characters
2016-09-09, by mkkharel [Fri, 09 Sep 2016 05:26:16 +0000] rev 1
Expanded the number of characters
initial
2014-02-08, by seeed [Sat, 08 Feb 2014 05:42:09 +0000] rev 0
initial