What's the best way to connect a wired magnetic contact stripe [edit: a "reed switch"] to the door, in order to detect whether or not it's open.

I'm not interested in a wireless one, I'm building all the circuits from scratch, so I want a wired one.

The way I thought to do that is, to use a push button interface (in my case, a KNX PBI), and connect it to the a magnetic contact stripe on the door.

Here is an example for a KNX PBI.

On the door the magnetic contact stripe would close/open the circuit and notice the PBI when the door is closed/opened.

My question is, what's the best location to place the PBI? Should I place a switch near the door, and put the PBI behind it?

Should I pull the cables of the PBI far, to the fuse box?

(Migrated from home improvements SE site, as seems more relevant here.)

  • \$\begingroup\$ You should add a link to the KNX PBI. What is it? Also, I guess that English is not your first language. You should add your country into your user profile so we can make allowance for that. \$\endgroup\$
    – Transistor
    Aug 7, 2017 at 8:35
  • \$\begingroup\$ Unless you want additional things connected to the PBI right there, you might as well just wire the reed switch back to the main control box, or somewhere you can fit one PBI to monitor multiple doors. \$\endgroup\$
    – Finbarr
    Aug 7, 2017 at 8:53
  • \$\begingroup\$ @Finbarr wouldn't I be limited by the distance? Would it be a good idea to have a long cable for the PBI at home? \$\endgroup\$ Aug 7, 2017 at 12:09
  • \$\begingroup\$ @Transistor apologies for my English. I'll be glad if you'll let me know how can I improve my writing. \$\endgroup\$ Aug 7, 2017 at 12:09
  • \$\begingroup\$ Your English is excellent. I think you did a literal translation to "stripe". We use "reed" as in a "reed of grass". (Those switches have long, thin metal contacts.) If we can see in your profile what country you are from then sometimes someone can give you a better translation. \$\endgroup\$
    – Transistor
    Aug 7, 2017 at 14:01


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