Re: Firing Sequential Ignitors with Just One Switch?

In article <1127816881.920181.309480@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Ike <ikenewton@xxxxxxxxx> wrote:
>
>Hi Tim...
>
>I'm really looking for a way to chain any number of ignitors, not just
>10. One button is pressed, and the first ignitor in the chain is lit
>and blown off the chain (electrically speaking), then the button is
>pressed and the next ignitor in the chain is lit, and so on.

Here's a thought that occurred to me - it's probably a bad idea, but I'd
like to have it shot down professionally.

Construct a number of independant counters - each initialized with the
sequence number of the igniter, and set to actually ignite when and only
when the counter reaches zero.

Connect all your counters to a shared bus, and make it so that pushing the
button signals all counters simultaneously to 'count down one step'. Thus,
evey time you press the button, another counter will reach zero, and that
counter will then ignite its rocket.

You can, in this setup, even configure several counters to fire
simultaneously, simply by setting them to the same sequence number.

You could even then have a completely automatic launching sequence, simply
by replacing your button with a 555 or similar.

As everything is nice and modular, you could start out with modules that
use a four-bit counter (which will allow for a max of 15 distinct launch
events), and later add wider ones if necessary, while the narrower ones
still retain their usefulness.

Each counter module would need a counter, a way to pre-set the value, and
perhaps a small display to display the current remaining count just so you
can check things are as they should be.

Let the shooting-down begin!

>Thanks!

Best wishes,

// Christian Brunschen



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