Yep. As @marktheknife said, people have done this many different ways, but if you just want to buy an off-the-shelf solution that works with SmartThings, here is the Nexia one he mentioned.
https://www.amazon.com/Nexia-Z-Wave-Doorbell-Sensor-DB100Z/dp/B017VVO9QQ
If you’d like to talk to people who are actually using it, see the following thread:
This is an initial Nexia Doorbell Sensor Device Handler release. I’ve added code to handle an occasional missed message condition reported with the earlier beta version. I’m sure there will be some oddities when used with different doorbell types, so please let me know of any issues. Any and all suggestions and updates welcome.
Nexia Doorbell Sensor (DB100Z) Device Handler
So far, I’ve been pleased with the device. It may be the simplest means yet to receive doorbell notifications on the SmartThings Hub. For anyone interested, I also put together a full review with several images of the device here .
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