You could have pointed out the line that is giving you the problem.
Also - your use of global is poor. It only happens if a certain
condition happens, otherwise it won't be defined in that function that
may be where the problem is. More importantly, you don't need a
'global' in the main-line code. You need it in the function (at the
beginning) to let the function know that you want to reference the $pin
var in use in the main-line code.
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