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Archive for April, 2014

Raspberry Pi Digital Signage

April 16, 2014 1 comment
I recently helped out the Dunedin Gasworks Museum with creating their digital signage system using a Raspberry Pi.  The aim was to create a system that was very easy to use and update the content, but at a low cost.
I initially looked into creating a presentation in LibreOffice and auto-playing that – but there were a number of issues with trying to automate a presentation:
  • There’s a considerable delay when starting a presentation in LibreOffice whilst it loads.
  • The editor window always appears first before the presentation starts, which doesn’t look very good.
  • Slide timings mean the presentation advances through slides automatically, but there doesn’t seem to be a way to end the presentation automatically (without clicking the mouse).
In the end it was a lot easier to simply run through files in a folder on a USB stick, and display them (depending on extension – video/image etc). If the slideshow folder is not present on any USB device the system will drop to a login screen (so system changes can be made for example).

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Categories: Linux Tags: , ,

Show username/password fields when “Other…” user doesn’t show on login window

April 16, 2014 Leave a comment

Ever tried to log into a Mac and the login window only shows a list of users and not the “Other…” option to switch to the username/password fields?  You know the username and password of a user that can log in (via bound directory services or something) but can ‘t get to the field to enter them?

Here’s how:

  1. Press an arrow key to move the selection rectangle around a user that shows.
  2. Press Option(Alt)+Return.
  3. Username/password fields will magically appear.

 

Categories: Apple, Mac OS X