Plug the RFID module into the breadboard with enough space around it. Connect the VCC pin to the Arduino's 3.3V (not 5V), and ...

Global variables use 15388 bytes (4%) of dynamic memory, leaving 312292 bytes for local variables. Maximum is 327680 bytes. Arduino Uno R4: Sketch uses 133756 bytes (51%) of program storage space.

The Code Execution nodes 1A, 1B, 2A, 2B are used to generate its corresponding strings like "1a", "1b", "2a" and "2b". The Variable Aggregator nodes A and B where the bug lies aim to aggregate the ...