I made this because I wanted to try an RFID tag and thought this might be a simple project to start with.
First of all, connect the RFID module using the picture below.
Then, the LED should go to digital pin 6 and GND. This will be activated when the RFID tag is over the module.
Time to code! Download GETUID.ino. This will get the UID or the tag. The only thing I changed in this code was move the printHex function to before setup() and loop(). Upload this code and in the Serial Monitor, the UID should be displayed.
Next, download RFIDLED.ino. I added the led part in this code. Upload this and hover the RFID tag close to the module. The green LED should come on!