You could write to an LCD, or to an SD card. The SD card isn't exactly real time, but it could work, with patience. Or use a Mega, Leonardo, or Micro with multiple serial ports, and an FTDI cable to connect the other serial port to the PC.
You could write to an LCD, or to an SD card. The SD card isn't exactly real time, but it could work, with patience. Or use a Mega, Leonardo, or Micro with multiple serial ports, and an FTDI cable to connect the other serial port to the PC.