lsusb

fuser /dev/ttyUSB0

kill -9 17997

sudo chmod a+rw /dev/ttyUSB0

lsmod | grep ftdi

sudo usermod -aG uucp $USER

sudo tail /var/log/messages

sudo dmesg | grep tty

modprobe ftdi_sio

~/.arduino/preferences.txt

serial.debug_rate=9600

sudo chown $USER /dev/ttyUSB0