Cernwall is a collection of Arduino and Python scripts, configuration files, documentation etc., designed to drive WS2812 LED strips.
Note that code for ESP8266 is 88CD in another github repository: https://github.com/aapris/WS2812FX
Use ssh or local keyboard to log in Raspberry Pi 3 running Raspbian 2017-09-07-raspbian-stretch-lite.img or perhaps some newer version.
On Mac Os X you can flash SD card using a command something like this (it may take a couple of minutes):
time sudo dd bs=4m if=2017-09-07-raspbian-stretch-lite.img of=/dev/rdisk2
After successful flashing Raspbian to SD card,
enable ssh, on OS X touch /Volumes/boot/ssh.
Then put the SD card into Raspberry pi, boot, log in to it
and issue following commands:
time sudo apt update && sudo apt -y upgrade && sudo apt -y install git python-pip python-dev libyaml-dev libffi-dev libssl-dev cdbs sshpass
This will take some time, maybe more than 10 minutes.
time sudo pip install "ansible<2.4"
cd /home/pi
git clone https://github.com/aapris/CernWall
cd CernWall/ansible
time ansible-playbook -vv -i "cernwall," -c local cernwall.yml --extra-vars "ap_ssid=SSID ap_passphrase=PASSWORD hostname=HOSTNAME"
NOTE: You MUST change correct SSID, PASSWORD and HOSTNAME in the command above!
In other case things are not going to work!
Consult the author or CernWall's management staff to get the right values.
NOTE: This will take some time, so crab a cup of coffee or tea.
After ansible is ready, reboot Raspi:
sudo reboot
If you ever have to update the firmware of ESP8266 which is controlling the LED lighs, you can do it from Raspi.
Get precompiled binary esp8266_webinterface.ino.d1_mini.bin.
Install esptool:
pip install esptool
Flash the firmware
/home/pi/.local/bin/esptool.py --port /dev/ttyUSB0 write_flash 0x00000 esp8266_webinterface.ino.d1_mini.bin && screen /dev/ttyUSB0 115200