hey all
I need to know what is the name of the switch, which is in the following picture and if possible the RS code for it.

 

It's a momentary pushbutton switch.

 

Search "tactile switch" at http://www.rselectronics.com

Ken

 

They're commonly known as a SPST tactile switch.

Radio Shack does stock them, but you would not want to buy 12 of them at $3.99/each.
http://www.radioshack.com/product/i...&cp=2032058.2032230.2032278&parentPage=family

Mouser sells a very similar switch for $0.26 each:
http://www.mouser.com/Search/ProductDetail.aspx?qs=fMKjfF2mFogxxxF7SUHlkQ==
$3.12+ shipping vs $47.88 is pretty attractive.

The lead spacing isn't quite right for standard 0.1" perfboard hole spacing, but you can make them fit if you're careful.

As far as the design, you could make it more compact. Right now, you have:
COM
(unused)
1
2
3
(com)
(unused)
4
5
6
....etc...

Instead, you could wire it as:
COM
2
1
3
(com)
5
4
6
...etc...
Just an idea.

 

I ain't a US citizen, so these resources isn't useful (knowing the name of this part is good enough.
what I want to do is to convert this matrix keypad
http://ae.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=1156031#header
into a non-matrix keypad by creating my own one and using the eao as a template with changing the matrix circuit
will it work ?

 

Yes, it would - but why not use the multiplexed keyboard to simplify your wiring, and where you need the discrete signals use a demultiplexer IC?

 

This is Cherry from China, This is my first time to come here, I learned a lot. Thanks.