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homebridge-securitysystem
Homebridge plugin that creates a security system accessory that can be triggered by HomeKit sensors.
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node-sonos-http-api
An HTTP API bridge for Sonos easing automation. Hostable on any node.js capable device, like a raspberry pi or similar.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
So, I have a security system setup through homebridge. Every night, when the system is armed, there are a number of sensors that could trigger this (all natively setup through HomeKit):
This works quite well as a system that I've tested a few times. When the system triggers, all lights come on full brightness in every room as well as garden and garage and our Sonos system plays an alarm sound on full volume from every room using the http api. Because the speakers in the garage would play too, this would alert our neighbours if we were ever away.