List devices using command and find serial port of correct device
npm install -g @serialport/list
serialport-list
Start application by specifying correct serial port and http port, for example:
npm start --serial-port=/dev/ttyACM0
Device ID for diffraction motor control:
usb-Arduino__www.arduino.cc__0043_75833353035351D03121-if00 Arduino (www.arduino.cc)