hello.. i would like to ask.. im getting this problem.. and im not understand because im new here.. any suggestion for me?
Arduino: 1.6.7 (Windows 7), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"
D:\Users\Asus\Documents\Arduino\HomeSecurity\HomeSecurity.ino:18:38: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
Password password = Password( "1234" );
^
Sketch uses 11,522 bytes (4%) of program storage space. Maximum is 253,952 bytes.
Global variables use 933 bytes (11%) of dynamic memory, leaving 7,259 bytes for local variables. Maximum is 8,192 bytes.
avrdude: ser_open(): can't open device "\.\COM3": The system cannot find the file specified.
avrdude: ser_drain(): read error: The handle is invalid.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.