I've been playing around with these ......
after seeing https://community.home-assistant.io/t/mqtt-enabled-led-sign/7475
So mine is based on 3 modules connected together, currently without a box but hopefully I will get round to building one The controller is a Wemos D1 Mini, which is small enough to fit in the back of the box and I can add some sensors if I want. I may add a temperature/humidity sensor, a smoke sensor and a lux sensor to set the brightness automatically. However for now it will output the following mostly via HA publishing to MQTT :-
 = Date/Time (Grabbed from NTP)
 = Good Morning/Good Afternoon/Good Evening (Done internally based on time)
 = My Bitcoin Value (Published by HA)
 = Livingroom Temperature (Published by HA)
 = Livingroom Humidity (Published by HA)
 = Todays Weather (yweather current) (Published by HA)
 = Tomorrows Weather (yweatyher day1 condition) (Published by HA)
 = Any plant needs attention (Published by HA)
 = Alarm set for xx:xx (not done atm)
 = Message from the web I/F or if connected from serial I/F
On HA I've added a group card to control the speed of scrolling, the brightness, the text effects and whether it's displayed or not.
I'm using the MD_Parola software (https://majicdesigns.github.io/MD_Parola/index.html) to animate the sign.
I'm very pleased with it and am already thinking of other uses for it (messages and perhaps alarms for smoke/fire or windows/doors left open)
I would like to thank Kmanoz https://community.home-assistant.io/u/kmanoz for his work on OTA updates, which I've shamelessly copied and Koen01 https://community.home-assistant.io/u/koen01 for his idea
When I finally put it in a box I'll post an image here.
Added Sky News RSS feed gathered by the Wemos - seems to work pretty well
Added Evacuate/Panic sign for smoke/fire etc - not completely working yet
Added option to turn off/on individual lines