I’d like to get an outdoor Temperature Sensor that can be used with HA and Google Home. Anyone have any recommendations?
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I’m not sure how you guys would feel about this… but I have a SDR connected to my Unraid server and found that a neighbor has one of those Acurite 5-1 weather stations that I can pick up on a 433mhz signal, parse the JSON file and added it to my dashboard. If you have a SDR sitting around you could scan your area and see what you get.
I second using an SDR with 433MHz devices. Incredibly reliable and low power.
Been using a nooelec SDR and one of these sensors:
Never thought of this approach.
So, what is it transmitting? Text? Or some form of numerical data?
I mean, how do I start? 🙂
Each device has its own protocol/payload, but there is a utility called rtl_433 that can decode about 200 of them.
If you’re keen on tinkering a bit I would highly recommend going this route as it’s a lot of fun and opens the doors to do all kinds of stuff.
Start by getting an SDR. I don’t recommend the super tiny ones since they can get really hot (since it’ll be running 24/7). I have this one and recommend it as it comes with an antenna etc. Nooelec RTL-SDR v5 Bundle
While you’re waiting for that to arrive set up an MQTT broker if you haven’t got one running already (the Mosquitto add-on in HA) and install the rtl_433 add-on as well.
From there read the rtl_433 docs to set up a config file to scan for what you want. Out of interest I set mine to rotate through a bunch of common frequencies and let it go for 24h to see what it could pick up. It was quite interesting! Another good way to do this is any wireless device will have an FCC number on it. You can look that up on their website and it’ll tell you what frequency it’s using and you can have your SDR scan that. If you don’t specify any protocols the rtl_433 utility will try everything it knows how to decrypt. This can be CPU intensive especially on a Pi so once you know what protocol it is you can specify it in the config file to reduce CPU load.
Hopefully that’s enough to set you down the right path. Happy scanning!
Great summary, thanks
It’s really easy. The rtl_sdr software interprets the info and passes out to HA. There’s an add-on that scans that info and looks for devices it recognizes, and adds then to HA as a sensor. You’ll get weather, tire pressure monitors, and other things.
Yup! In addition to temperature/humidity sensors, I’m also pulling in my gas meter and my home security sensors(I was using a big-name security company, but when my contract was up I kept the sensors installed and tapped into them with my SDR)
I’m using the Philips hue motion sensor for outdoors https://www.philips-hue.com/en-us/p/hue-outdoor-sensor/046677570989 it has also temperature. But I’d kind of rather had humidity build in.
I use this one: https://www.aqara.com/us/temperature_humidity_sensor.html
If you already have ZigBee setup it’s easy to use these, if not maybe look for something else.
I have one of these outside stuck to my soffit, not in a case, and it’s been solid for me.
I also use one of these outside with a 3D printed case. Still going strong after about 18 months!
I have two of these outside, jankily sealed up with electrical tape, and they’ve survived the British weather for a year so far.
Same one I use, also made an enclosure to 3D print and protect it from rain. It’s been going on without issues since 2020 https://www.printables.com/model/169425-xiaomi-aquara-thermometer-outdoor-case
