The simplest way to do this in ST would be to get a:
- Door sensor (like a Monoprice or EcoLink door/window sensor) - these are Z-Wave devices
- Buy a bunch of devices that act like Chimes
- you can get a ZooZ Smart Chime (Z-Wave device) or
- you can buy some IRIS/Lowes/Xfinity keypads from eBay for about $10-$20 each - these are ZigBee devices. If you’re using keypads, you may want to use this device handler to get access to the ring/chime [RELEASE] Enhanced ZigBee Keypad Device Handler - Centralite, UEI, IRIS, Xfinity, Scout
Install the chimes next to the office you want, the ZooZ chime is loud, the keypads are relative softer, your choice.
Once this is done you have a couple of options, you can use CoRE or WebCoRE to create a simple rule, when the door opens, “chime” the chime devices.
If you have access to RBoy Apps you can use this app (if you have access it’s an easy setup):
The key thing to note for whichever device/solution you decide to do with you need to create a strong mesh. If you’re using Z-Wave device then add a Z-Wave repeater device (any mains powered device like a Monoproce/ZooZ plug/socket) every 30ft or so (2-3 should be good). If you’re using ZigBee devices then add a ZigBee repeater (any mains powered device like a Peanut or Iris or Samsung socket/plug) every 40ft or so (2-3 should be enough).
After installing reboot your hub and do a Z-Wave repair. Creating a strong mesh will go a very long way in determining the “response” time of your setup. 1-2 second is very doable with a low latency internet connection and a good mesh.