How can i make Arduino stand alone without powering it via usb & writeDigitalPin() slow response problem

i uploaded arduino code but if i unplug the usb and plug it again i just lose my programe how can i slove this and also writeDigitalPin() function is so slow in response

Answer 1

[Madhu Govindarajan]

To make arduino stand alone you need to have the Simulink support package installed - http://www.mathworks.com/hardware-support/arduino-simulink.html