RFID (RC522) simple signal strength detection via changing antenna gain
Based on RC522 and Arduino R3. RC522 does not have the capability to read signal strength. In this case, the code changes antenna gain to detect whether it can read the tag or not. It can only read 7 levels of signal strength and which is enough for a basic demonstration. LCD is an optional choice for this. The LCD displays signal strength of reader in dB.
Steps to reproduce
1. Install rfid-master for arduino, which could be found in Git Hub. 2. Connect the parts with your computer. 3. Run the code. 4. Change the distance between tag and reader to see the change of signal strength.