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TL;DR Use the "find handset" feature of common wireless house phones for a DIY doorbell.

This one is about as easy as it gets, and the result could not be better.

Having moved into a home with no doorbell, we wanted to ensure we could hear the ring from the basement and back yard. I did some research and found plenty of multi-chime systems, from cheap to expensive, but I knew this had DIY written all over it.

Unrelated, we bought a wireless phone set which can connect to bluetooth, so my wife and I can receive calls to our mobiles and pick up anywhere in the house. This particular unit (VTech) also has a "push to talk" to other handsets, and a full Intercom mode which is more like a normal phone call. Unfortunately, both involved (a) taking the handset off the charger and (b) either holding the push-to-talk button or going into a submenu for Intercom.

I was going to try the push-to-talk feature, when I discovered the "Find Handset" button on the main base unit. It made a very nice chirp in all three of the handsets, which lasts a minute, then automatically stops. Perfect!

After some not-so-minor wrangling to get the case opened (there were some snap-overs which did not want to budge), I was able to solder some small-gauge speaker wire across the button's contacts, and thread it out to a nice handsome $5 button outside. We have a through-wall mail slot, which made it easy to get the wire out.

I imagine this could be done with a wireless doorbell setup as well; just a matter of getting to the receiver to make a similar jump.

Test video here:
http://youtu.be/gqnKlrVWFYY 

Installed video here: 
http://vine.co/v/bv7QMKhDwzg 

This is pretty much exactly what I want to create...but I'd really need a ton more guidance on it. Help?
Do you have a house phone with a "find handset" feature? That's about all I used. Just bridged the same switch and wired to a button outside.
Yes, I do! Well then, that DOES sound easy! :-). I will have to try this out. Thanks for the simple guidance. :-)

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