sign controller

content cycler for https://github.com/sheffieldhackspace/train-signs

to run:

cp .env.example .env
nano .env
./run.sh

set up on Pi server

# generate key
ssh-keygen -f /usr/shhm/.ssh/trainsigncontroller-deploy-key
# upload to GitHub as deploy key
cat /usr/shhm/.ssh/trainsigncontroller-deploy-key.pub
# create user
sudo useradd -r -s /bin/false trainsign
# install packages
sudo apt install gawk curl html-xml-utils
# to-do: make systemd service file
sudo cp train-sign-controller.service /etc/systemd/system/
sudo systemctl enable train-sign-controller
sudo systemctl start train-sign-controller
sudo systemctl status train-sign-controller

update

./update_from_git.sh
# to-do: restart service

to-do

examples of instant events

• (MQTT A) door A has been opened (image/anim/text)
• (MQTT A) door A has been closed (image/anim/text)
• (NP1) intercom rung (not yet on MQTT)

examples of a content cycle (sent as web requests from other device)

• (GRF1) current temperature (⁰C)
• (GRF1) current internet usage (kB /s)
• (GRF1) current power usage (W)
• (FTBL) next football game (datetime)
• (WEA) weather (see https://github.com/alifeee/weather_landscape/) (image)
• (ART) SHHM logo animation (image/anim)
• (OJ) 3D printer progress bar? from Octoprint (image/text)
• (WIKI) current membership numbers
• days until EMF camp

MQTT A : listen for MQTT messages. spec here : https://github.com/sheffieldhackspace/space-state-visualiser/blob/5692f13d855bc1f7fa9d57666e8374df0841ac5a/listeners.json#L8-L14

NP1 : not possible unless Phil/Paul attaches intercom buzzer to MQTT (quite possible via isolated switch)

GRF1 : available via appropriate curl request to InfluxDB/Grafana : https://wiki.sheffieldhackspace.org.uk/members/projects/monitoring

FTBL : custom parsing of webpage similar to https://github.com/sheffieldhackspace/football-fixtures-webhook

WEA : for textual weather description, I think some (MET?) APIs include a textual weather forecast field : for image, see link above in original list item

ART : you'd just make this as an image/gif

OJ : no idea how to do this, but presumably it's simple enough using an API request. would have to check if printer is on or not before sending request, lest it timeout

WIKI : curl the wiki and use hxselect ;] - hope the format doesnt' change :]