I have a U300 door handle with lock. It works great. I’d like to add a control for the deadbolt without adding another keypad etc. is this possible?
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I have had a need in the past to do something similar but I was looking for a smart lock for storm doors. I am running several U300s and don’t believe they support any stand-alone deadbolts.
While the U300 may not support it, there are smart locks out there that will integrate through Home Assistant or Apple Home. A small automation could link the deadbolt with the U300. The U300 exposes a “lock.” entity so that automation could be as simple as unlock the deadbolt when lock. changes to “Unlocked”.
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Hello
You could simplify control the deadbolt with the Aqara relay and use an automation like Outburstin refered
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What’s the use-case for two smart locks on a single door? Just more security? 
The automation route is possible, but I’d expect some latency.