Current Status: Ideating, visualising and day dreaming while the samples arrive.
27 Jul 2012:
Today while browsing the net in search of LED driver, I came across an interesting IC from austriamicrosystems AS1130. The chip is a 132-LED Cross-Plexing Driver with scrolling Function. Woah, thats a lot of LEDs to be controlled by a single IC. As at the present moment I am working on an LED clock using MAX7219 IC and given the fact that the MAX7219 can control 64 individual LEDs, the subject IC instantly grabbed my attention.
DIY-ers and Hobbyist like me are always short on money and micro-controller pins but are always big on ideas, so every pin saved is an extra functionality/blinky led added. I just glanced through the datasheet and said ‘ I must have that IC’. So I rushed to their samples page to try my luck.. and boy, I was lucky and as the things stand now.. my samples (3 in no) are on my way.
The next step, was what am I going to do with it? Since flavour of the season with me is ‘Word Clock’ .. so I have decided to go ahead and build a word clock with this IC.
28 Jul 2012:
Had some spare time, so went through the IC’s datasheet. I realised that unlike other LED drivers, this IC required LEDs to me wired up in a different fashion, its a variant of Charlie-Plexing , called CrossPlexing. Charlieplexing is the most common form of multiplexing LEDs and it has taken me a bit of time to understand CrossPlexing wiring. I have attempted to draw a x-plexed LED matrix in eagle. It has taken me a bit of time to draw this and I am not quite sure whether this will work or not. Following is the preliminary layout
Crossplexed 132 LED Array
Also I came across a tutorial from digikey on CrossPlexing.
.. to be continued.