A quick & dirty web app for real time counting the in & outs in a facility, as well as the real time occupation of the different zones
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is to be used as a Google Sheet App (the Google sheet is the database) -- the code is in Tools > Script Editor
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Sheet1 contains the current values at the appropriate places
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Log_A to Log_E log each operation (+1, -1, 0)
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quite slow but enough for the purpose