Recording temperature in multiple rooms

A string of DS18B20 sensors hooked from a USB to 1-Wire dongle?

I'm looking for a wireless solution ideally, as running wires to each sensor would be a pain.

I don't have any problem with DIY solutions using arduino / raspberry pi as I'm comfortable with electronics and programming. But I suspect commercial solutions should be able to do things cheaper and with a smaller size than a DIY solution.

I've ordered one of these Xiaomi Aqara temperature/humidity sensors:

and these:

As far as I can tell 'Aqara' is Xiaomi's line of Zigbee sensors and 'Mijia' is their line of Bluetooth sensors. I haven't explored the Bluetooth side of things, but there are sensors like this:

Thanks for that link - I much prefer something like this that uses a standard protocol like ZigBee then a proprietary RF protocol as one day I might want to add additional sensors or integrate the temperature readings into a central heating control system.

I've got a few of those around the house. Seem to work very well with good battery life (well over a year), and comprehensive logs can be downloaded. Motion sensors too.

I use mine with a Samsung Smartthing hub. The Xiaomi sensors need some fettling - details are on the community forum. But, it's not at all intuitive, and I have have to relearn when they occasionally don't reconnect after a power cut etc.

Yes, I'd have tried the Pi route if I didn't already have the Samsung hub. The advantage of that is once things have paired, it has a lot of good notification and monitoring options via the app.

Agreed. If you look at the list of devices supported by zigbee2mqtt:

(Now, if somebody did some affordable UK wall sockets with measurement, that would be very handy...)

Theo

The Philips Hue motion sensors have internal temperature sensors and are very reliable indeed and standard zigbee protocol.

Not cheap but Amazon do regular big discounts and most of the major retailers will match amazon prices.

'kin how much?

They regularly get discounted by amazon and may well be in the boxing day sales.

Hue has one now too. And there are others.

Here's the Amazon proce history:

Meanwhile, in rest-of-world land, $13:

Although really what would be nice is 13A wall plates with built in measurement...

Theo

Just because it claims to be original Xiaomi doesn?t mean that it actually is. It would be interesting to see a Big Clive tear down of that and a real original Xiaomi MI.

And yet it has an AU plug and that is a much smaller market and it isnt as if the standard is much easier to comply with.

And is physically very unsatisfactory compared with one that has an UK socket and plug.

Not so convenient to use tho given that you are unlikely to be able to afford to have them all like that.

Xiaomi use the 'mijia' name on quite a range of different products.

You could always retrofit something like the Shelly 1PM 'smart' relay behind your existing sockets. Only ?14.99 so not too expensive if you weren't looking to do your whole house.

I have a Dallas 1 wire sensor connected to a Raspberry pi. I does write a file of the temperature readings. I only managed to get one sensor to work.

Thanks, that's interesting.

It turns out, if you're prepared to go wifi rather than Zigbee, There are in fact a whole range of ~$10 sockets with an ESP8266 inside them, from a Chinese ODM 'Tuya' and sold under many brands.

I might have a play with a Shelly...

Theo

I would prefer MCBs / RCBOs with built-in power measurement if such things exist. Knowing which each ring or radial is drawing would be very useful - much better than a smart meter which can only tell you the total house consumption.