Card Setup Code #include <SPI.h> #include <MFRC522.h> // Pin definitions for Arduino Uno and MFRC522 RFID reader #define RST_PIN 9 #define S

hello i am not sure if this is the right place for this but i need help with a project.
i need to step up the 5V from arduino nano to 28V DC. idealy at least 10 amps.
please any suggestions welcome

I highly doubt that's going to happen. Assuming 100% efficiency, that would require the Nano to supply 5V at 56A to whatever circuit you have in mind. And the Nano, like all other Arduinos, is not a power suppy.

Interesting topic title though.

Control a relay that can pass 28VDC at10A. arduino relay 28vdc 10amps at DuckDuckGo