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I'm researching about RFID Technology as i'm trying to build a RFID Reader using an Arduino and/or Raspberry Pi which i been trying to do so for a month however with no avail. So i been reading up as much as i can however i can't seem to find a proper answer.

There're 3 frequency ranges 125KHz (LF), 13.56MHz (HF) and 900MHz (UHF) for RFID Tags Than there're different readers but for example 'Grove - 125KHz RFID Reader'

Question

  1. The reader mentioned about 125KHz, so does that mean it can only read 125KHz Tags? Or can it also read the higher frequencies?
  2. What if i purchase a 900MHz(UHF) Reader, will that read only 900MHz tags? or all the others?
  3. SAlso i'm confused about RFID and Mifare. All the boards such as 'RFID-RC522' and 'PN532' boards says to read RFID but their codes only read MiFares
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RFID is a generic term for the technology, like Wireless, Stereo, Fuel Injection...

Mifare is a Philips brand name for a particular 13.56 MHz system. At 13 MHz, read carefully about what tags the reader will read. There are a few types, ISO14443 specifies one standard.

Systems for one frequency cannot do other frequencies, everything about the reader is built around the frequency choice.
(There might be dual-band 125/13.56 systems, then they would work with both specified bands.)

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