Re: A shorter version

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Subject: Re: A shorter version
Name: Bob
Date: 2/1/2005 7:55:02 AM (GMT-7)
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In Reply to: Re: A shorter version posted by RoadRunner

Are you using a lock check & a door open check in each room ?.
Are you skipping this check in the last room ?
What are the lights for ?. Are they inputs or outputs ?.

Will 20 push buttons be good enuf to cover all problem inputs ?.
Are you using a keypad ?.
Most keypads are or at least were very hard to wire & required 2 diodes per button.
Made more complex if an interrupt line is needed.
Most keypads are wired with a common & makes wiring the keys ruff.
There is also another problem with button or keypad inputs.
Its called bounce & basicly the switch does not make a good connection right away.
Your checking the switch up to millions of times a second.
Also a dirtry switch can give you a button on signal when in truth its only dirt.
This can be fixed by programming or by hardware.
In programming you store a good button count & when you reach a certain number you know your safe.
So you need to pick an input device & the wiring & programming choices can be made then.

How many lines do you need for the TCP/IP ?.
As I think you are nearing the limits of your PIC even with row & collum.

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