Steps to Setup Raspberry Pi (In headless mode)

1. Using Balena Etcher, burn the image 2019-04-08-raspbian-stretch-full.zip to micro sd card.
2. In the freshly created boot drive, create an empty file named ssh in the boot folder. This is for enabling ssh access by default.
   • In linux, mount the sd card sudo mkdir /media/sdcard && sudo mount /dev/sdb1 /media/sdcard
3. Create another file called wpa_supplicant.conf. This is for enabling wifi and configuring default wifi connection details.
4. Power on Raspberry with the sd card.
5. Figure out the IP address of Raspberry.
   • From the Wifi Admin console. Or,
   • Using network scanning tool like nmap — nmap -sP 192.168.x.0/24
6. SSH to raspi with default credentials, i.e., login: pi and password: raspberry
7. Install Dataplicity.
8. Change password with command passwd
9. Free up space by uninstalling following libraries.
   sudo apt-get purge -y wolfram-engine libreoffice* && sudo apt-get clean && sudo apt-get autoremove -y
10. Expand the file system sudo raspi-config

    Advance Options —> Expand File Systems Reboot

11. Update and upgrade sudo apt-get update -y && sudo apt-get upgrade -y
12. Install Vim sudo apt-get install vim
13. Install PIP
    • wget https://bootstrap.pypa.io/get-pip.py
    • sudo python3 get-pip.py
    • sudo rm -rf ~/get-pip.py ~/.cache/pip
14. Install pre requisites for Open CV3
    • sudo apt-get install -y libhdf5-dev libhdf5-serial-dev libhdf5-100
    • sudo apt-get install -y libqtgui4 libqtwebkit4 libqt4-test python3-pyqt5
    • sudo apt-get install -y libatlas-base-dev
    • sudo apt-get install -y libjasper-dev
    • sudo apt-get install -y build-essential cmake pkg-config
    • sudo apt-get install -y libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev
    • sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
    • sudo apt-get install -y libxvidcore-dev libx264-dev
    • sudo apt-get install -y libgtk2.0-dev libgtk-3-dev
    • sudo apt-get install -y libatlas-base-dev gfortran
    • sudo apt-get install -y python2.7-dev python3-dev
    • sudo apt-get install ffmpeg -y
    • sudo apt-get install byobu -y
15. Install Virtual Environment
    • pip install virtualenv=='16.6.1' virtualenvwrapper=='4.8.4' --user
    • echo -e "\n# virtualenv and virtualenvwrapper" >> ~/.profile
    • echo "export WORKON_HOME=$HOME/.virtualenvs" >> ~/.profile
    • echo "export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3" >> ~/.profile
    • echo "source /home/pi/.local/bin/virtualenvwrapper.sh" >> ~/.profile
    • Add /home/pi/.local/bin/ to $PATH (in ~/.profile)
    • source ~/.profile
    • mkvirtualenv cv3-py2 -p python2
16. Use byobu for running detached ssh sessions. So that, even if dataplicity gets disconnected, your installation process isn't interrupted.
17. Activate virtual env and install Numpy
    • workon cv3-py2
    • pip install numpy=='1.16.4'
18. Install OpenCV3 by compiling. Source
    • cd ~ && wget -O opencv.zip https://github.com/Itseez/opencv/archive/3.3.0.zip
    • unzip opencv.zip
    • wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/3.3.0.zip
    • unzip opencv_contrib.zip
    • mkdir ~/opencv-3.3.0/build && cd ~/opencv-3.3.0/build
    • cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_FFMPEG=ON -D WITH_TBB=ON -D WITH_GTK=ON -D WITH_V4L=ON -D WITH_OPENGL=ON -D WITH_CUBLAS=ON -DWITH_QT=OFF -DCUDA_NVCC_FLAGS="-D_FORCE_INLINES" -D INSTALL_PYTHON_EXAMPLES=ON -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.3.0/modules -D BUILD_EXAMPLES=ON ..
    • Increase swap size
      • sudo vim /etc/dphys-swapfile
      • Update CONF_SWAPSIZE=1024
      • sudo /etc/init.d/dphys-swapfile stop
      • sudo /etc/init.d/dphys-swapfile start
    • make -j4
    • sudo make install
    • sudo ldconfig
    • cd ~/.virtualenvs/cv3-py2/lib/python2.7/site-packages/
    • ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so
19. Installing Keras and Tensorflow. Source
    • wget https://github.com/samjabrahams/tensorflow-on-raspberry-pi/releases/download/v1.1.0/tensorflow-1.1.0-cp27-none-linux_armv7l.whl
    • pip install tensorflow-1.1.0-cp27-none-linux_armv7l.whl
    • sudo apt-get install libhdf5-serial-dev
    • pip install h5py
    • pip install pillow imutils
    • pip install scipy --no-cache-dir
    • pip install keras==2.1.5
20. Revert swap size
    • sudo vim /etc/dphys-swapfile
    • Update CONF_SWAPSIZE=100
    • sudo /etc/init.d/dphys-swapfile stop
    • sudo /etc/init.d/dphys-swapfile start
21. Install Nginx
    • sudo apt install -y nginx
    • Setup basic authentication echo “innocule: 'openssl passwd -apr1'" | sudo tee -a /etc/nginx/htpasswd.users
    • Check nginx config sudo nginx -t
    • Restart nginx sudo systemctl nginx restart
22. Clone the github repo. git clone git@github.com:<github-repo>
23. Add crontab for restarting the flask process on reboot.
    • crontab -e
    • Add this to crontab — @reboot <path to startup script>/startflask.sh
24. Create a backup image of SD card
    • Connect the SD card to laptop and check the name lsblk and space df -h
    • Unmount the SD card, E.g. — sudo umount /dev/sdb1 && sudo umount /dev/sdb2
    • Create a img file sudo dd if=/dev/sdb of=backup-image.img bs=4M; sync