RFID

--configuration
writer = peripheral.wrap("right");
reader = peripheral.wrap("left");
redside = "back";

label = "GateKey";
data = "this is the gate key";
range = 5;

print("Simple in-secure RFID door!");
print("Key name: "..label);
print("Scanning Range "..range);

function main()
while true do
 --If there's a card in writer
 --and it is blank
 --and we're not currently writing
 if writer.isPresent() and (not writer.isCoded()) and (writer.getProgress() == -1) then
   --make a key
   writer.encode(data,label);
 end
 redstone.setOutput(redside,readerloop());
 os.sleep(.5); --allows redstone to move
 os.queueEvent("marker_event"); --clears event
 repeat
   e = os.pullEvent();
 until e == "marker_event";
end
end

function readerloop()
  reader.scan(range);
  while true do --split from here
    e,p1,p2,p3,p4,p5 = os.pullEvent()
    if e == "rfid_detected" and p1 == data then
      return true;
    elseif e == "rfid_scan_done" then
      return false;
    end
  end
end

main()