** Connecting Two 4x4 Matrix keyboards in parallel **

[Rolec]

matrix keyboards

Hello,

Does anyone got experience in connecting 2 pieces of a 4x4 Matrix keyboard in parallel
without any other interface? Is there a limitation in the distances of the cables?
Any information concerning this matters is very welcome.
I want to connect two of these to an alarm system.

THX
Rolec

 

[Sebi]

connect two 4x4

Hi,

this is no problem on the table,but for long distances not recommended.I think You can try with a good screened 10m cable.
Zsolt

 

[admiral]

I agree with Sebi, A big distance wouldn't be a great idea.
For sure the paralleling can be done although the pressing on both keyboards will give you an indication as if you have pressed 2 keys on one keyboard mixing up things a little bit.
Good debouncing and solving of such problems must be done carefully.