Difference between revisions of "Ledslie"

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* Wifi SSIDs being broadcast
 
* Wifi SSIDs being broadcast
 
* Next and last tram / metro / nightbuses -- Eg: http://v0.ovapi.nl/line/GVB_2_1
 
* Next and last tram / metro / nightbuses -- Eg: http://v0.ovapi.nl/line/GVB_2_1
* Incoming rain alerts (https://www.buienradar.nl/overbuienradar/gratis-weerdata, https://br-gpsgadget-new.azurewebsites.net/data/raintext/?lat=52.35&lon=4.83)
+
* Done: Incoming rain alerts (https://www.buienradar.nl/overbuienradar/gratis-weerdata, https://br-gpsgadget-new.azurewebsites.net/data/raintext/?lat=52.35&lon=4.83)
* Clocks
+
* Clocks + Midnights ("Midnight in «City»")
 +
* Drama stats
 
* API/Interface for countdowns.  
 
* API/Interface for countdowns.  
 
** Next TI events
 
** Next TI events

Revision as of 12:11, 25 November 2017

Projects
Participants Chotee, Thijs
Skills electronics, microcontrollers, linux, mqtt, webservices
Status Active
Niche Electronics
Purpose Infrastructure

Interface to display information

  • It is a Grayscale display of 144x24 pixels that displays information.
  • It lives at http://ledslie.ti/ and is accessible at the space via a website and mqtt.

Interfaces

  • At http://ledslie.ti/ you to submit content, such as animated GIFs, from your browser.
  • You can publish content by posting content to the web-service.
  • You can publish content directly to the mqtt broker that lives on ledslie.ti:1883.

Content ideas (in no specific order)

How it works

Wifi --RF> Getchip --USB2> Teensy --[data,clock,latch]> Led-pannel

The led-panel takes 20V DC as input. At full output it's pulling about 4A, or about 80W. There's a small switcher-board that supplies the 5v the the getchip and Teensy from those 20V.

The Teensy drive code is here: https://github.com/techinc/ledmatrix/tree/master/ledmatrix144x24

The Ledslie code can be found here: https://github.com/techinc/ledslie

Possible Hardware expansions

  • Add another panel by adding a USB2 hub, and modding another of the led panels with the teensy taking over the driving logic.

FAQ

  • Q: What's that noise? A: The panel is being driven at rates way beyond the original design and we're well in the audible frequencies with the refresh-rates and some components are merrily humming along.
  • Q: Why are some points brighter then others? A: Turns out that LEDs do wear. In their previous life some LEDs were on for years, while others were always off. There's plans to compensate for this in software.