dyeatman
Joined: 06 Sep 2003 Posts: 1934 Location: Norman, OK
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Posted: Sun Jun 29, 2008 8:16 am |
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The ! is a standard NOT symbol in most languages. You need to get a standard C primer and start reading. It is also shown on page 32 of the current manual. !PIN_B1 means if NOT PIN_B1 which is testing or a 0, FALSE or LOW condition rather than a HIGH. |
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