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Sci.Electronics.Basics -> the order in which some switches are turned on
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Author: lauraDate: 01:18 23-04-08
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Hi all,
I have an array of N switches . Initially all are OFF.
Somebody turns them ON in some order. It is possible that more
switches are turned ON in the same moment.
I need a device which shows me the order in which the switches were
turned ON. For instance the device should give me: 4,3,1,5,2 (this is
the order in which the switches were turned ON).
The way in which the output is shown in not important. It must be
simple to read (by a human, computer, etc).
It is important that the device is able to handle the turned ON (in
the same moment) of the multiple switches.
thanks,
Laura
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Author: google@woodall.me.ukDate: 06:05 23-04-08
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On Apr 23, 6:18 am, laura <laura.brandu...@gmail.com> wrote:
> Hi all,
>
> I have an array of N switches . Initially all are OFF.
>
> Somebody turns them ON in some order. It is possible that more
> switches are turned ON in the same moment.
>
> I need a device which shows me the order in which the switches were
> turned ON. For instance the device should give me: 4,3,1,5,2 (this is
> the order in which the switches were turned ON).
>
> The way in which the output is shown in not important. It must be
> simple to read (by a human, computer, etc).
>
> It is important that the device is able to handle the turned ON (in
> the same moment) of the multiple switches.
>
Impossible to do. Even at 0.1" separation between the switches, that's
8 pico-seconds at the speed of light. It's impossible to uniquely
determine the order of switches for all observers if they are turned
on within this time.
If you're allowed to quantize time so that switches that change within
a certain space of time are defined to be simultaneous then just clock
the switches into a latch and then test for any changes. Repeat.
Tim.
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