How about an Arduino Mega with 3.3 Volt I/O with 5 Volt tolerance?
How about a single DIP chip, full duplex, I/O level shifter with selectable I/O voltage levels?
How about an Arduino Mega with 3.3 Volt I/O with 5 Volt tolerance?
How about a single DIP chip, full duplex, I/O level shifter with selectable I/O voltage levels?