Something I can use in place of relays

[Rick]

A little back ground
I have a computer set up wired to speakers around the house. I have wired
the keyboard to different switches as well around the house e.g. when
someone pushes the door bell its wired to the letter A and the software on
the computer looks for what letter is pushed and then plays the
corresponding .wav file.
I want to put those magnetic switches on every window so when the window is
open again a wav file will be played e.g. " someone has opened up the
bedroom window" the problem that I have run into is that when the window is
opened its like holding down the key on the key board. I have used two
relays so that when the window is opened it turns on relay one and one set
of contacts on relay one is a switch for relay 2 but on relay 2 there is a
resistor so it does not come on at the same moment that relay 2 does and the
keyboard is wired in series through one set of contacts on each relay so I
get a momentary on.

So my question is I have several windows and doors and would need two relays
for each is there any way that I could accomplish the some thing another
way.

Thanks
Rick

 

[the Wiz]

"Rick" <rickj@sympatico.ca> wrote:

A little back ground
I have a computer set up wired to speakers around the house. I have wired
the keyboard to different switches as well around the house e.g. when
someone pushes the door bell its wired to the letter A and the software on
the computer looks for what letter is pushed and then plays the
corresponding .wav file.
I want to put those magnetic switches on every window so when the window is
open again a wav file will be played e.g. " someone has opened up the
bedroom window" the problem that I have run into is that when the window is
opened its like holding down the key on the key board. I have used two
relays so that when the window is opened it turns on relay one and one set
of contacts on relay one is a switch for relay 2 but on relay 2 there is a
resistor so it does not come on at the same moment that relay 2 does and the
keyboard is wired in series through one set of contacts on each relay so I
get a momentary on.

So my question is I have several windows and doors and would need two relays
for each is there any way that I could accomplish the some thing another
way.

Thanks
Rick

Use the switch contacts to trigger a one-shot. It will deliver one pulse and
return to its original output state.

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