Hermod TV Panel

Installation

Beginning

• Create user hermod: (as root or sudo) adduser hermod
• Put it in the same groups as pi (other than the pi group): groups pi | sed 's/ /,/g', usermod -a -G group1,group2,... hermod
• Change pi and root passwords
• sudo apt remove wolfram-engine minecraft-pi
• sudo apt autoremove
• sudo apt update && sudo apt upgrade && sudo reboot
• sudo apt install git vim screen htop xdotool
• sudo date -s '2018-02-15 2:26:00' if needed (change the date to current date ofc)
• Generate RSA key ssh-keygen -t rsa -C "hermod.inno@gmail.com" -b 4096 and add it to gitlab
• Clone project in ~: git clone git@gitlab.viarezo.fr:hermod/tv_panel.git
• cp front/src/config.template.js front/src/config.js
• cp server/config.template.js server/config.js
• Useful links: ln -s ~/tv_panel/scripts/.screenrc ~/, ln -s ~/tv_panel/scripts/.vimrc ~/

Telegram message on startup to get IP address

• cp scripts/waitForNetwork /root/scripts/waitForNetwork
• cp scripts/startup-telegram-message /root/scripts/startup-telegram-message
• sudo vim /root/scripts/startup-telegram-message to add the token and chat id
• Add in root crontab (sudo crontab -e):

@reboot sleep 1 && /root/scripts/waitForNetwork && /root/scripts/startup-telegram-message

Boot config (only on Pi zeros)

vim /boot/config.txt to comment out dtparam=audio=on -> #dtparam=audio=on and add

# Serial
enable_uart=1
dtoverlay=pi3-disable-bt

Reboot

Download nodejs:

• wget https://nodejs.org/dist/v10.3.0/node-v10.3.0-linux-armv6l.tar.xz (to adapt to most recent version, for Pi zeros)
• wget https://nodejs.org/dist/v10.3.0/node-v10.3.0-linux-armv7l.tar.xz (to adapt to most recent version, for Pi 3B+)
• tar xf node-v10.3.0-linux-armv6l.tar.xz (or armv7l)
• sudo mv node-v10.3.0-linux-armv6l /usr/lib/nodejs/node-v10 (or armv7l)
• vim .profile to add:

# Nodejs
export NODEJS_HOME=/usr/lib/nodejs/node-v10
export PATH=$NODEJS_HOME/bin:$PATH

After reboot or log out - log in, npm install -g yarn pm2

WS2812

• Wiring: VCC -> |<diode| -> 5V, GND -> GND, Data -> (resistor ~100 ohm) -> (pin 12 / BCM 18 / PWM0)
• sudo apt install scons python3-dev swig
• git clone https://github.com/jgarff/rpi_ws281x.git && cd rpi_ws281x
• Edit main.c to put good stuff (width height for testing):

#define WIDTH                   1
#define HEIGHT                  1

Make it Python3 compatible:

In python/neopixel.py file:

• Add from builtins import range after # Author: Tony DiCola... line (beginning)
• xrange -> range in lines 33 and 46

In python/setup.py file, insert 3 lines after line 13:

    url               = 'https://github.com/jgarff/rpi_ws281x/',
    install_requires=[
        'future',
    ],
    py_modules        = ['neopixel'],

• scons
• sudo ./test to test

Python3 installation

In python folder,

• python ./setup.py build
• sudo python ./setup.py install

Display a status LED without root, and avoid overhead lag

Back to tv_panel directory

• cp scripts/statusRGB_listener.py /root/scripts/statusRGB_listener.py
• Add in root crontab (sudo crontab -e):

@reboot /usr/bin/python3 /root/scripts/statusRGB_listener.py

• Reboot or run /usr/bin/python3 /root/scripts/statusRGB_listener.py & as root
• To display a color for t seconds (float): echo "55ee33 1" > /dev/rgb_pipe

Disable screen sleeping

vim .config/lxsession/LXDE-pi/autostart to add

@xset s noblank
@xset s off
@xset -dpms

RFID reader

Communicate with the module

• Wiring: VCC -> 5V, GND -> GND, RX -> TX, TX -> RX
• In sudo raspi-config, disable serial messages but enable serial interface

Get and compile libnfc

wget https://github.com/nfc-tools/libnfc/releases/download/libnfc-1.7.1/libnfc-1.7.1.tar.bz2
tar xvjf libnfc-1.7.1.tar.bz2
cd libnfc-1.7.1
vim examples/nfc-poll.c

Here you must comment out the bloc near the end of the file that waits for card removing (if not, the stream doesn't end until card removal and this is very impractical).

  // printf("Waiting for card removing...");
  // while (0 == nfc_initiator_target_is_present(pnd, NULL)) {}
  // nfc_perror(pnd, "nfc_initiator_target_is_present");
  // printf("done.\n");

Exit vim and continue to the compilation:

./configure --prefix=/usr --sysconfdir=/etc
make
sudo make install
sudo mkdir /etc/nfc
sudo cp libnfc.conf.sample /etc/nfc/libnfc.conf
sudo mkdir -p /etc/nfc/devices.d
sudo cp contrib/libnfc/pn532_uart_on_rpi.conf.sample /etc/nfc/devices.d/
sudo cp contrib/udev/42-pn53x.rules /lib/udev/rules.d/

Start the TV panel at startup

Put in the hermod contab (crontab -e)

@reboot sleep 10 && cd /home/hermod/tv_panel && export NODEJS_HOME=/usr/lib/nodejs/node-v10 && export PATH=$NODEJS_HOME/bin:$PATH && /home/hermod/tv_panel/scripts/waitForNetwork && NODE_ENV=production /home/hermod/tv_panel/scripts/update_server.sh