![]() ![]() The tag draws power from it, energizing the circuits in the tag. When radio waves from the reader are encountered by a passive rfid tag, the coiled antenna within the tag forms a magnetic field. Radio waves are used to transfer data from the tag to a reader.Ī passive tag is an RFID tag that does not contain a battery, the power is supplied by the reader. This is the advantage over Bar-code.Ī RFID reader is a device used to gather information from an RFID tag, which is used to track individual objects. A tag can be read from up to several feet away and does not need to be within direct line-of-sight of the reader to be tracked. Radio- Frequency Identification ( RFID) is the use of radio waves to read and capture information stored on a tag attached to an object. Before we move to actual code lets know more about RF ID. ![]() This library read and write different types of Radio-Frequency IDentification (RFID) cards on your Arduino or NodeMCU using a RC522 based reader connected via the Serial Peripheral Interface (SPI) interface. In this tutorial we will learn How to interface NodeMCU with RC522 RF ID Reader using Arduino library for MFRC522 and other RFID RC522 based modules.
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