für einige sense.funktionen() muss man sudo sein!
arduino kann extern mit 7-18V versorgt werden. der +Pol muss dabei am tip sein, keinesfalls sleeve!
http://playground.arduino.cc/Learning/WhatAdapter
GETTING STARTED WITH SENSE HAT:
https://www.raspberrypi.org/learning/getting-started-with-the-sense-hat/
Connect your Sense HAT and boot up the Pi.
First update and upgrade your system by entering the following commands into a Terminal window (while connected to the Internet):
sudo apt-get update sudo apt-get upgrade
Then install the Sense HAT software package:
sudo apt-get install sense-hat sudo pip-3.2 install pillow
if problems installing pillow with pip-3.2 (eg. in ubuntu-mate), then:
http://unix.stackexchange.com/questions/163948/package-installed-but-not-detected-pip3-2
and
sudo -H pip install –upgrade pip
sudo -H pip3 install –upgrade pip
Finally, reboot the Pi to complete the installation:
sudo reboot