I have ardiuno in which i have connected mfrc522 rfid reader , so i want the data which rc522 have readed from ardiuno. I have tried using have tried it using sketch which is written in cpp but i want...

I'm working with Electron and Johnny-Five to process some data I read with my Arduino Mega 2560 and I'm having some trouble testing my Arduino's connection. This is the method I want to test (ignore t...