Zigbee smoke, carbon monoxide, and gas alarms should always be treated as standalone safety devices first.
They need to be loud, local, and reliable on their own.
Home Assistant doesn’t replace that, but it gives you much quicker notice that something is happening.
Door and window contact sensors are hugely versatile and can be used in a number of home automation scenarios. These sensors often consume very little power and can run off of a single battery for many months.
A Passive Infrared (PIR) sensors is specifically designed to detect changes in infrared radiation within their field of view. Passive infrared radiation can be emitted from certain objects or warm-blooded creatures such as humans and pets.
