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 python3 python3-pil imagemagick
# 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)
• (OJ) 3D printer progress bar? from Octoprint (image/text)
• total repair café repairs

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

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