Ledslie
| Projects | |
|---|---|
| Participants | Chotee, Thijs |
| Skills | electronics, microcontrollers, linux, mqtt, webservices |
| Status | Active |
| Niche | Electronics |
| Purpose | Infrastructure |
Contents
Interface to display information
- It is a Grayscale display of 144x26 pixels that displays information.
- It lives at http://ledslie.ti and is accessible at the space via a website and mqtt.
Content ideas (in no specific order)
- Spacealert with message.
- IRC integration via shardik: .display [message]
- Indicio audio: What are we listening to?
- Wifi SSIDs being broadcast.
- Next and last tram / metro / nightbuses
- Incoming rain alerts
- Clocks
- API/Interface for countdowns.
- Next TI events
- TI ALVs
- Next interesting rocket launch (SpaceX, Soyuz, etc...)
- Space dates / launches
- ISS flyovers
- Zonsopkomst en -ondergang tijden
- Maan standen. volle maan, nieuwe, etc.
- http://www.apiblog.nl/
- External content
- Security.nl
- Theregister.co.uk
- hackernews.
- Radio Yerevan Jokes: https://duckduckgo.com/Radio_Yerevan_jokes?iax=1&ia=about
- Jargon file
- Btc/Eth values
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.
