Hi,
I am writing a programme of arduino to make a smart attendance system for our school, i have 150 RFIDs , i did all the setup with arduino, MFRC522 and the a memory card module. Its working fine the scanned data is stored in the memory card, now i want to send a notification sms to only absent student's parents ,i have connected a sim 800l successfully but how can i write a program to identify the remaining data which is not scanned in a specific time.
Since you know the 150 RFIDs you can compare them to the ones that have checked in. Those that haven't you put in a separate file. This will take a few moments to process but that should not be a problem. Or you can do this on the fly and instantly know how many are present/missing.
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