What did the office security people say when you told them this great idea?I'll answer (3) first. Would you think it is reasonable to type your employee ID into the phone app?What if you knew your boss's ID and put that in your phone instead of your own?2) you need an Arduino and NFC reader at every door. You need a tamperproof box for each one. You need a power supply for each one. You need power wires. You need to run cables through the walls and door frames. You need access inside the existing RFID boxes. You need technical advice from the company which males those boxes. You need someone to write the app. You need an Arduino programmer who is not a beginner. You need a security consultant.The one thing you don't need is an RFID transmitter.1) yes, but...
1) Is that possible to implement?
2) If yes, precisely which component do I need? I need to communicate them to my boss in order for him to buy them.
3) Follow up question: my smartphone ad the very beginning doesn't know my badge UID. How to "initialize" my android app to be aware of my UID?
The security is not a concern yet.
Put the office coffee machine on the intranet so you can see how much coffee is in it without getting up from your desk.
How can security not always be a consideration in a security system?