I have an Arduino program loaded to the Arduino. I want to plot the real time data from arduino in the MATLAB too. My MATLAB program can get the data from the Arduino board and plot successfully. However, it seems the MATLAB will write something to the Arduino board to override the Arduino program. Is it true? If the answer is positive, may I have a help that how can I get the data from Arduino without affecting the Arduino program? (P.S. both Arduino program and MATLAB program will read the same pin such as A0). Many thanks!