Description of project : 30 button every one is sepearate by 10 metre the LCD display name of presed button. this is my schema what you think ? i wait for your comment with lused
Exactly what should we comment on?
If the requirements is 30 buttons and a physical separation of 10 meters between each button, then there is no use for us to comment about it.
If you want any comments on your planned technology to implement it, then you better spend some time to describe how you are planning to to it.
This article might be worth a look:
en.wikipedia.org/.../Button_Moon
Makes as much sense as the original post
I guess the OP is asking for suggestions on how to carry the button signal across a 10m distance so that a microcontroller can sense the state of the buttons.
For example, each button could be a node on a FDDI ring, with a controller running a TCP stack so that when the button is pressed, it executes an HTTP POST operation on a checkbox widget back to a central server which can then update a web page with the names of the buttons and their current state. The nice thing about a dual ring is that it provides redundancy if you break one of the fibers.
The question is so vague that only guesses are possible.
My guess is that he's presented (a few of) his requirements, and wants people to provide solutions for him.
As he hasn't given any constraints on cost, performance or other such essential details, it's impossible to judge whether the FDDI ring with HTTP client nodes is appropriate or not...
Let's see if Marlap Lamb the Ace Professional Guesser can crack this one...
10m is not long distances. It's just a question of bandwidth. How short pulses must be possible to detect.
But it is important that the wires are twisted, and there should be the usual EMI filtering and overvoltage protection.
Unless all 30 are in 1 long line - giving a total of 300m...
And that is one of the problems with the OP post. Too little information, so no use speculating.