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- They are powered by a single AAA battery and specifically recommend rechargeable batteries (such as the IKEA LADDA)<\/li>\n\n\n\n
- They use Matter over Thread for communications and management and so integrate very nicely with Home Assistant – especially since I’ve got a working Matter over Thread ecosystem in both the Outbuildings and the House<\/li>\n\n\n\n
- They’re fairly compact – given they have to accommodate a AAA battery<\/li>\n\n\n\n
- They’re competitively priced; \u00a37 each in 2026 (although that seems slightly expensive compared to \u00a35 for a TIMMERFLOTTE temperature & humidity sensor) – whereas similar devices from other brands tend to be \u00a320 or more\n
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- That price does not include the battery, which is another \u00a31 (actually \u00a34 for a pack of 4)<\/li>\n<\/ul>\n<\/li>\n\n\n\n
- They report battery status both as a voltage and as “percent charged” figure (to the nearest 1%)<\/li>\n<\/ul>\n\n\n\n
On the tilt-and-turn windows it’s best to mount the sensors at the top, so they report ‘open’ no matter whether the window is tilted back or hinged open (like a door).<\/p>\n\n\n\n
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IKEA MYGGBETT door and window sensor mounted at the top of a tilt-and-turn window<\/figcaption><\/figure>\n\n\n\n These MYGGBETT sensors have a unique Matter ID printed along one side and I elected to mount them so that remains visible. There’s also a printed QR code used for commissioning but that’s only visible when the sensor is unclipped from its backplate.<\/p>\n\n\n\n
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If I was doing this again, I would at least install the wiring for hard-wired sensors – which would mean checking which windows have opening sections (about half of them) and whereabouts on the opening windows the sensor would be located. I would wire them with 4-core ‘alarm’ cable back to a central point, with the plan to connect them to a KNX binary input module – something like the MDT BE-16000.02 Binary Input Module for Potential-Free Contacts<\/a>. Note that costs \u00a3200 for 16 channels, i.e. \u00a312.50 per input. In addition, there would be the cost of the cable (roughly \u00a31 for a 5m run) and the magnetic \/ reed-switch sensor itself (about \u00a32 each for a basic ‘Grade 1’ sensor<\/a>) which works out at about \u00a316 per window (assuming a 7.5m cable run) so actually the battery-powered sensors are roughly half the price – but need ongoing attention to their batteries. (Arguably a proportion of the cost of the Thread Border Router required to receive the Matter over Thread signals should be included in the cost of the battery-powered sensors, but that was only \u00a335 and covers all other Matter over Thread devices too.)<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
One thing I sometimes wish I’d hard-wired for before plastering the House is contact sensors to report the open \/ closed state of the (openable) windows – mostly so that the automations which close the roller blinds can be ‘blocked’ … Continue reading