Your best bet is to use a unpowered rfid tag. These can be small and embedded into a card or tag similar to NFC in your credit card for tap-to-pay. Rfid however has further range, even un-powered to ~15 feet from personal experience.
Ive used this in a project before to automate attendance of students of mine. Apon walking past a door with a rfid sensor you will no longer need to do manual attendance.
The issue however is, unlike nfc which is built into many smart phones, rfid will require a reader spart-phone compatable reader which can be found online pretty cheap but i dont know the range of those. You will likley need a higher quality uhf reader otherwise the range of your reader will be under a foot at best. This puts alot of the financial burden on people who purchase a quality uhf reader, as the tags themself are cheap to embedd.
Politics aside, this is a handy idea if you are needing any proximity based identification system hence why it is used in warehouses often.
Ive used this in a project before to automate attendance of students of mine. Apon walking past a door with a rfid sensor you will no longer need to do manual attendance.
The issue however is, unlike nfc which is built into many smart phones, rfid will require a reader spart-phone compatable reader which can be found online pretty cheap but i dont know the range of those. You will likley need a higher quality uhf reader otherwise the range of your reader will be under a foot at best. This puts alot of the financial burden on people who purchase a quality uhf reader, as the tags themself are cheap to embedd.
Politics aside, this is a handy idea if you are needing any proximity based identification system hence why it is used in warehouses often.
Statistics: Posted by davidm8624 — Wed Jul 30, 2025 9:29 pm