Arduino Rfid Adaptor Module

1int RfidInputPin = 3; // set the pin that the rfid is connected
2int RfidTrigger; // variable to save the state of the pin
3
4void setup() {
5  Serial.begin(9600);
6  // set pin 3 as INPUT
7  pinMode(RfidInputPin, INPUT);
8}
9
10void loop() {
11  // read the state of pin 3
12  RfidTrigger = digitalRead(RfidInputPin);
13  // if the state is HIGH then print RFID ON
14  if (RfidTrigger == HIGH) { 
15    Serial.println("RFID ON");
16  } 
17  // if the state is HIGH then print NO RFID 
18  else {
19    Serial.println("NO RFID");
20  }
21  // read every 100ms
22  delay(100);
23}