It should be possible to use two different barcodes,
to detect the difference between the door opening and the
door closing (based on the order of the scans within
a short interval) so you could list the current status
(open or closed).
As to the code at hand ... why use
instead of localtime ?
You might also want to change it so it updates a data file
with the value of i ... that way if the script
dies for any reason, you still know the total.
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