I have a raspberry pi b+ running raspbian jessie, and I want to use the command line to send strings to the arduino, I don't need to receive anything though. I have found a couple of ways of doing this, but there are no files in /dev/ called ttyS. I have used the arduino with the official serial monitor that comes with the ide, and it works perfectly. I have tried echo "Hello World!" >/dev/ttyAMA0
but it says permission denied
I am loged in as pi over ssh, as suggested in deacs answer, I did sudo usermod -a -G dialout pi
and it's not saying permission denied, but nothing is being recieved by the arduino. it is the only thing plugged into usb.
The output of groups
is:
pi adm dialout cdrom sudo audio video plugdev games users input netdev gpio i2c spi