Radio-Frequency Identification (RFID) uses electromagnetic fields to transfer data through wireless.
- RFID Devices consist of two part
- Tag
- Reader
- Tag contain electronically stored information.
- Information read by the reader.
RFID Tag
- A RFID system uses tag, attached to the objects for identification.
- Readers send a signal to the tag and read its response.
- Tag is read-only the tag uses the radio energy transmitted by the reader.
- Each tag have unique serial number,by using this tag number it is easy to identify product details.
Rfid Reader
- There are different type of reader available in market.
- Passive Reader Active Tag.
- Active Reader Passive Tag.
- Active Reader Active Tag.
Passive Reader Active Tag
- System has a passive reader which only receives radio signals from active tags (battery operated, transmit only).
Active Reader Passive Tag
- System has a active reader, which transmits interrogator signals and also receives authentication replies from passive tags.
Active Reader Active Tag
- System uses active tags a woken with an interrogator signal from the active reader.
Application
- Transportation payments.
- Transportation and logistics.
- Public transport.
- Libraries.
- Hospitals and healthcare.
Hardware Required
- RFID Reader.
- RFID Tag.
- Arduino.
Rfid Pinout
- Vin= +5V.
- Tx= Rx of Microcontroller.
- Gnd= Ground.
Circuit

virtual Circuit

Code
char input[12]; int count = 0; void setup() { Serial.begin(9600); } void loop() { if(Serial.available()) { count = 0; while(Serial.available() && count < 12) { input[count] = Serial.read(); count++; delay(5); } Serial.println("I received: "); for(int i=0;i<12;i++) Serial.print(input[i]); Serial.println(); } }