[Dan Kouba’s] parents replaced their doorbell button with one that ... this and after some investigation he build a replacement board for the chime unit based around an ATtiny26L.

A wired doorbell ... chime. The only potential problem is that the existing transformer may not supply enough power for both chimes. If you have a 15V transformer, you should replace it with ...

Here's how to check to make sure your setup will work: Ring your doorbell to locate your chime box. Remove the cover and look ...

The installation took about 45 minutes, which involved replacing my existing doorbell with the Logitech one and installing a small chime box that sits out of sight on the top of the existing chime in ...