I'd have a hard time imagining gas pumps using just an AVR, because they have some pretty large LCD screens and fancy cryptography for tap to pay. And I'd imag

I'd have a hard time imagining gas pumps using just an AVR, because they have some pretty large LCD screens and fancy cryptography for tap to pay. And I'd imagine anything that big and expensive would use Ethernet or something, rather than messing around with any low level serial link business. But one could just make an embedded Linux based controller as one of the standard modules.