Raspberry Pi enable ttyS0

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How to activate /dev/ttyS0 on Raspberry Pi

1. Disable tty console (ask google, or use raspi-config)

2. Add pi to dialout group

sudo usermod -a -G dialout pi

3. Make link to ttyACM0

cd /dev
sudo ln ttyAMA0 ttyS0

4. Optional: Install terminals

sudo apt-get install minicom cutecom