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
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
pi adm dialout cdrom sudo audio video plugdev games users input netdev gpio i2c spi