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[on:]

Hello,
I would like to build a reader/writer for HID 125KHz RFID tags. I am just starting to learn how RFID works and thought building this would be fun. Does anyone know where I could find a chip or shield that will read and write the cards? If I build a reader/writer for HID 125KHz tags can the same circuit be used to read other manufacturers 125KHz tags?
Thank you,
Bgsneeze

[Reply #1 on:]

I'm not sure if this will work with your tags, but it is a RFID read/write shield.
http://adafruit.com/products/789

Do you have a link to your tags?

[Reply #2 on:]

I would like to build a reader/writer for HID 125KHz RFID tags.

Most tags at 125KHz are read only. The ones you can write to are just to put the readable ID into the tag, there is no room for data.

If I build a reader/writer for HID 125KHz tags can the same circuit be used to read other manufacturers 125KHz tags?

Some but not all. There are different ways a tag can encode data so it has to match the HID way in order to work.

[Reply #3 on:]

@Pauly
That link is for:-

the perfect tool for any 13.56MHz RFID or NFC application.

So it is not a 125KHz tag.

[Reply #4 on:]

This is a 125kHz reader:

http://iteadstudio.com/store/index.php?main_page=product_info&cPath=16&products_id=6

Although it claims to be also a writer I've never seen a writable 125kHz tag.

There are two version of it, they differ in the reading interface. To begin go for the UART version.

[Reply #5 on:]

The cards I am looking at using are these: http://www.hidglobal.com/documents/proxcard_ds_en.pdf

For the time being, Just being able to change the ID would work for me to learn with.

[Reply #6 on:]

For the time being, Just being able to change the ID would work for me to learn with.

That is all you can do with those cards you can't write any data.

[Reply #7 on:]

Are there shields or antennas that can be bought/ built for reading/writing the HID 125KHz cards?