The 'bell signaling' system used in the Cornish tin mines worked very well for 
over 30 different underground signals.. Why not incorporate a piezo and use a 
similar system. Even mobile phones use Morse.. SMS in Morse code when you 
receive a message. No need to keep looking at the equipment for when it wants 
to warn / inform you.

On 8 Feb 2008 at 23:10, Steve Howes wrote:

> >> How about blink-codes?
> >>
> > I dislike blink codes.
> > "Fast blinking = X
> > slow blinking = Y"
> >
> > well is that flashing there fast or slow?
> 
> 1 flash for error 1.. 2 flashes for error 2..
> 
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