I take it you've already read this: Arduino Playground - PRFID
Replace the Serial.print in the example with an IF statement to see if it's the right tag code, and then do digitalWrite(13, HIGH); or something.
I take it you've already read this: Arduino Playground - PRFID
Replace the Serial.print in the example with an IF statement to see if it's the right tag code, and then do digitalWrite(13, HIGH); or something.