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= 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. = Known issues (and their solution) = * Symptoms: The screens network dependent screens are missing, time might be incorrect. http://ledslie.ti is not available. * Problem: The DHCP server was not available when Ledslie started up, and is now in network-less mode. Likely there was a space power failure. * Solution: Once the network is stable again, cycle the power of Ledslie, it should restart properly. = Content ideas (in no specific order) = * (Done-ish) Spacealert with message. Still missing working shardik code. * IRC integration via shardik: .display [message] * (Done) MPD songs: What are we listening to? * Wifi SSIDs being broadcast / MAC count stats ** https://arstechnica.com/information-technology/2014/11/where-have-you-been-your-smartphones-wi-fi-is-telling-everyone/ ** https://www.hak5.org/episodes/haktip-23 * (Done) Next and tram / metro / nightbuses * (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) * (Done) Clock * (Done) Midnights ("Midnight in «City»") * Days until Brexit * Drama stats ** Parse the ML archives, get stats from there --- https://techinc.nl/cgi-bin/mailman/listinfo/ + https://techinc.nl/cgi-bin/mailman/listinfo/discuss ** Keep track of IRC stats --- https://gist.github.com/habnabit/5823693 * API/Interface for countdowns. * (Done) Next TI events * Space events ** Next interesting rocket launch (SpaceX, Soyuz, etc...) ** ISS flyovers * (Done) Zonsopkomst en -ondergang tijden * (Done) Maan standen. volle maan, nieuwe, etc. * External content ** (Done) Btc/Eth values --- https://www.cryptocompare.com/ ** https://radar.squat.net --- https://0xacab.org/radar/drupal-make/wikis/api/1.1/notes ** Security.nl ** http://www.apiblog.nl/ ** Theregister.co.uk ** hackernews. ** Radio Yerevan Jokes: https://duckduckgo.com/Radio_Yerevan_jokes?iax=1&ia=about ** Random Jargon file entries = 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 = Software = The system's software is available at https://github.com/techinc/ledslie , this repo contains code that's running on the Display. = 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.
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