I've got a Tinkerkit (RIP) DMX master shield, which communicates with Arduino on pin 3 and 4. Can I safely jump these pins to pin 0 and 1 to use the hardware serial port?
Alright, and the serial port RX would still get triggered with the lower voltage due to the resistor?Or is it in this case just limiting current?
That's why people buy USB-TTL-Serial boards. Pins 0 and 1 are "occupied" unless you remove the Arduino bootloader from the board.