RPi and Arduino Pro mini 3.3V

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Some References

Raspberry Pi

Do not run a terminal on the serial: edit /etc/inittab Comment the line

#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

edit /boot/cmdline.txt and remove

console=ttyAMA0,115200

or any other reference to ttyAMA0