Basic command line skills
    ssh csci373@uncacsci-piN-L
    touch empty.txt
    echo CSCI 255 file
    echo CSCI 255 file > file.txt
    nano life.txt
      ........
    mkdir playpen
    cd playpen
    echo Raspberry Pi > another.txt
    cd
    ls
    ls -l
    ls -ld
    ls -la
    ls -lR
    ls -laR

Create an account
    id
      ... make note of the gid fields
    sudo adduser YOURUNAME
    sudo adduser YOURUNAME sudo
    sudo adduser YOURUNAME gpio
    sudo adduser YOURUNAME i2c
    ls /home
       Find the login id of a CSCI 178 student, call them <asmith>
       Don't type the <>'s in the following commands
    grep csci373 /etc/passwd
    grep YOURNAME /etc/passwd
    grep YOURNAME /etc/group
    logout
    

Using SSH
  ssh uncacsci-piN-L
    id
    sudo cat /etc/shadow
    logout
  ssh-keygen
  ssh-copy-id YOURNAME@uncacsci-piN-L
  ssh uncacsci-piN-L
    
<a href="https://pinout.xyz/">Raspberry Pi Pinout</a>

<a href="https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup">Adafruit's Raspberry Pi Lesson 4. GPIO Setup</a>
<a href="https://learn.sparkfun.com/tutorials/raspberry-gpio/python-rpigpio-api">Raspberry gPIo


Pretend we are setting up the Raspberry Pi libraries
    ## browse https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code
  git clone https://github.com/adafruit/Adafruit_Python_ADXL34
  git clone https://github.com/adafruit/Adafruit_Python_LSM303
  git clone https://github.com/adafruit/Adafruit_Python_PCA9685

Use the PCA9685 and accelerometer
  i2cdetect -y 1
  cd Adafruit_Python_PCA9685
  cp examples/simptest.py ~/pwm.py
  cd
  nano pwm.py
  ls -d Adafruit_Python_*
  cd Adafruit_Python_<YOURACCELEROMETER>/examples
  cp simptest.py ~/acc.py
  cd
  nano acc.py
    ## follow directions to add the #! (sh-bang) on first line
  chmod a+x acc.py
  ./acc.py

Do something with the Servo or LED
  cp pcm.py servo.py
  nano servo.py
    ## write a program to gradually vary speed of servo...
    ## look at sections 4.1 to 4.3 of Python control flow tutorial
    ## https://docs.python.org/2/tutorial/controlflow.html