Arduino Playground is read-only starting December 31st, 2018. For more info please look at this Forum Post Interfacing... Arduino and Linux TTY Elliott Kipp/edk4971 posted in the forums on how to configure a Linux TTY with the correct parity, baud, etc to talk to Arduino. Repeating it here: stty -F /dev/ttyUSB0 cs8 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -ec