hi
i want to take data from arduino instead of only displaying it on the arduino software.
let me tke one example
if i want to plot a graph of that data using matlab or any other software then wht should i do?
The software you want to use to display / analyse the data from Arduini must support serial communication (often called RS2332).
Then it's just a matter of sending data over the serial line from Arduino to your software on the PC.
The USB port on Arduino is really a serial port. On your PC there will be a virtual serial port when your Arduino is connected to it. This port can be used by your software just as any "normal" serial port.