Playground.arduino.cc will be read-only starting December 31st, 2018. For more info pleae look at this Forum Post

CentOS 6.x

  • Download the current Arduino IDE from arduino.cc
  • uncompress into a directory of your choosing (e.g. /usr/local/arduino or /opt/arduino, etc.)
  • to run as a normal user add that user to the the 'lock' group