I once went to the public library, this time in Hamburg (Germany) just check out
the catalog, kind a complex pile of paper to find out about, which page would
apply to my task. I then ordered the page, after paying quite a bit money, I got
the page I ordered, but not quite the information I wanted.
The trick in Germany is to use the university libraries. They're free, and they also have the full DIN library if it's a technical university. Sometimes you have to show your student ID, but if you walk in there self-confident looking, they won't even ask. That's how I experienced it in Aachen (my hometown) and Cologne.
Back on topic:
From my experience, devices with only one LED normally use the cheapest colour, which is red. If you want to indicate something, I'd say the hirarchy is:
green: Everything OK yellow/orange: alert red: fault
Mobile phones only blink the LEDs every other second to save power. This "every other second" was patented by Ericsson AFAIK, but since other mobile phone vendors also made it, I guess the patent was crushed.
You can also use a blinking at higher frequency to indicate "user action necessary", or to emphasize the alert/fault.
I think the whole thing boils down to psychology. If you're not an expert on this, ask any non-technical person what he/she might think about a colour or blinking frequency. From my experience, girls tend to act more intuitive with technical stuff, so take their word for the LED colours (and don't tell them that blue LEDs are available ;-)).
ciao, -- Jens Sch�nfeld
-- Author: Jens =?iso-8859-1?Q?Sch=F6nfeld?= INET: [EMAIL PROTECTED]
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