this post was submitted on 26 Jun 2023
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Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
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I've had good luck with this Zigbee one. It's on the larger side, but takes AAA batteries which is nice. THIRDREALITY Zigbee Door/Window Sensor
Alternatively, if you're keen to tinker a bit you can get an SDR and then use 433MHz sensors. (Requires using RTL_433 and MQTT).
I was able to use the existing sensors from my traditional security system this way. Nice thing is that it's the most reliable wireless components on my system and the battery lasts forever.
I would suggest a nooelec SDR like this one: Nooelec RTL-SDR v5 Bundle
And something like this for sensors: Door Magnetic Contact Sensor