NNTP-Posting-Date: Fri, 27 Dec 2002 06:55:56 -0600
Subject: Re: job: Who can draw or send me a 1/10 second countdown timer?
Date: Fri, 27 Dec 2002 04:56:27 -0800
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easy and fast?
Suppose you have 10-position switches in the form of knobs. Suppose
you have one for each of four digits (DDD.D) and a button. This is
your timer interface.
Knobs change the numbers in each of the four digit positions, the
button starts and resets your timer. I think that, in the dark, this
would work much more easily.
Also, knob-wise, you might be able to work out some sort of
accelerative interface; that is, the longer you spin the knob for, the
faster the numbers change. This would allow you to get down to one
knob and a display, because you could have pretty ready access to just
about every number you could want. Sure, you'd have to fiddle with the
knob and probably twist it back and forth a little, but it'd be much
more tolerant to shaky hands and much easier to find/use in the dark
than a keypad.
But on the other hand, the backlit keypad thing would probably look a
lot cooler. ;)
On 18 Dec 2002 14:11:57 -0800, email@example.com (Michel) wrote:
>Yheah your right somehow, keyboard is hard in a darkroom, but that's
>the only way to change the time easy and fast. I was thinking on a
>special red-light underneed the keyboard... a glass-touch-keyboard...
>Maybe a turning button which gives many pulses up and down to preset
>the time would be nice... You can turn fast or slow and no light
>needed, though still the 7-segments need to give a bit of light...
>So what chips can be used for timer and/or 7 segments-display?
>firstname.lastname@example.org (Tim Shoppa) wrote in message news:...
>> email@example.com (Michel) wrote in message news:...
>> > Well I don't find any timer like I want it, not even in
>> > http://www.dimco-gray.com/timers.htm
>> Well, then, maybe we don't understand what you want to do. Gralab,
>> after all, has been in the business of making darkroom timers for
>> at least half a century.
>> > And if it is that simple can't anyone send me a diagram? Maybe there
>> > exist even a chip that does it all...7-segment + 1/10 second countdown
>> > + numberic keyboard reader.
>> Oh, sure, there are chips that will do it all hardware-wise - but then
>> you have to write the program that drives the hardware.
>> Don't get too hung up on the numeric keypad. In a darkroom, knobs are
>> a real plus, and numeric keypads are a real minus.