Apologies if it's been addressed before, I've tried to locate a thread which might help me resolve my issue without success...
I've tried implementing the RFID sketch from here: RFIDAccessControlSingle/RFIDAccessControlSingle.pde at master · practicalarduino/RFIDAccessControlSingle · GitHub, and have found that it did not work with the setup I've made by following the supplied instructions.
The circuit is very simple and has been confirmed to work with the exception of the RFID component, however, confirmed correct according to the schematic located here: practicalarduino.com.
After this, I've tried going much simpler, disconnecting everything from the Arduino and using a combination of the first code block found here: http://www.circuitstoday.com/interfacing-rfid-with-arduino — and adding a Serial.println statement inside the loop to see what is being written, while shorting the Tx and Rx pins so that it writes and listens to itself.
Doing all this has (at best) returned a -1, indicating that it had not received anything on the Rx pin.
Assuming the schematic is correct, is there anything else that could be done to see how this can be fixed? I've tried changing pin numbers too, but am completely lost now.
I'd really appreciate any help with this.