RFID ( or Radio Frequency Identification ) is a method which uses radio waves to capture electronically the data present in RFID cards or radio labels.
The RFID module consists of an antenna and a microprocessor.
Nowadays they are used in many sectors like nuclear.
A marker, named Radio-label, tag RFID, or transponder is placed on the item to identified and encoding digital data.
The reader sends an electromagnetic wave in the direction of the object to identified. It activates the marker, which returns information to it.
There are 2 type of tag :
Passive tag :
Without batteries, these tags take their energy from the magnetic or electromagnetic waves emitted by the reader at the time of their interrogation
These are low cost tags in energy
Active tag :
The active labels are equipped with a battery allowing them to emit a signal. They can be read from long distances unlike passive markers.
- 3.3v sur 3.3v
- GND sur gnd
- SDA sur D10
- SCK sur D13
- MOSI sur D11
- MISO sur D12
- RST sur D9
For the code we need 2 Library : SPI and MFRC522