FDX-B 134.2 kHz RFID reader

Other Hardware General Electronics
67

You can use boolean for it. If you wrote something like this :

boolean rfid_onetime = true ;
while (RFID.available()&&rfid_onetime)
{
rfid_onetime  = false ;
}
myServo.detach();
delay(600000);

after 600 000 you can define rfid_onetime =true .