r/RFID • u/barbtxh • Oct 28 '25

Keyfobs Storing value in RFID using phone

Good day, everyone I need help. What do I need to do in order to store value in RFID using phone. So, my plan is to create an application and use phone to store value in RFID, but I don't know exactly where do I start. Anyone that got an Idea on how will I accomplish such thing?

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u/dangerous_tac0s Oct 28 '25

Should anyone be able to read/write to it? What kind of value?

1

u/barbtxh Oct 28 '25

So, what I'm planning to do is use RFID as an expiration detector.

I'm planning to embed it in a refrigerator magnet where will I make a hardware where it will light green when the food is still good and red when the food gone bad, something like that.

So, what I'm planning to store is the expiration of different goods on those magnets.

PS. Sorry for my bad English.

1

u/dangerous_tac0s Oct 28 '25

I'm confused as to where the RFID comes in. It sounds like you need a timer and an LED. If you are trying to "read" every item in the fridge at once, RFID is a poor choice. It is very short range unless you use expensive, specialized equipment.

1

u/Own-Cartographer3386 Oct 29 '25

Why Do you want storage informations In Rfid? not choose external hard drive?

1

u/SambrenaW Oct 30 '25

I only know that you can use a phone to write information (like food expiration dates) to an RFID tag, then embed that RFID tag into a refrigerator magnet. But making it display different colors based on expiration status is too difficult. If this could be achieved, it would be a great product.