I\'m reading data from 9 different sensors for my robot and I need to display them all steadily, in the same window so I can compare the values and see if any of the reading
The Arduino serial monitor isn't a regular terminal so its not possible to clear the screen using standard terminal commands. I suggest using an actual terminal emulator, like Putty.
The command for clearing a terminal screen is ESC[2J
To accomplish in Arduino code:
Serial.write(27); // ESC command
Serial.print("[2J"); // clear screen command
Serial.write(27);
Serial.print("[H"); // cursor to home command
Source:
http://www.instructables.com/id/A-Wirelessly-Controlled-Arduino-Powered-Message-B/step6/Useful-Code-Explained-Clearing-a-Serial-Terminal/