A fold‑out stand for the desk or the bedside table, and magnets in the back for the fridge, a whiteboard or any steel surface. Nothing to drill, no cable to run.
Swings out from the back to stand it on a desk or shelf. Folds flat when it goes on the fridge.
Holds on the fridge, a whiteboard or a steel frame. The kitchen is where the fumes are.
Months on a charge, so put it wherever you want to know about the air: bedroom tonight, office tomorrow.
Visualisations.
Drag through an ordinary day and see what the device sees and when it speaks up. The day is an illustration; the messages are word for word what the firmware sends.
An infrared sensor counts CO₂ molecules directly instead of guessing from other readings. It rises when a room holds more people than fresh air, and at 1,500 ppm most people start to feel it. It measures every 5, 15 or 30 minutes depending on the profile, and sleeps in between.
A heated gas sensor tracks volatile compounds every five minutes and grades them on Bosch's seven‑class index. It calibrates itself over the first days, and keeps that calibration through firmware updates.
Bosch BME690 + BSECMatch it to a reference thermometer in the settings. Damp is judged by the dew point, not only by the percentage.
SCD41It watches the three‑hour trend. When pressure falls the way the Met Office defines a falling barometer, the screen says Rain or Storm instead.
BME690MET Norway needs no key and no sign‑up; OpenWeatherMap takes over if it doesn't answer. Humidity, wind and feels‑like sit along the bottom. Daylight saving follows your time zone by itself.
api.met.no · CC BY 4.0
The seven cells on the screen are the seven classes in the BME690 datasheet, and the advice is Bosch's own. Tap one.
CO₂ above the limit you set (1,100 ppm by default). The cells keep showing the gas class, so you see both at once.
Humidity high for two readings running, judged with the dew point: condensation and mould risk.
While the gas sensor is still learning, the screen says so, rather than showing a number it can't stand behind.
When something is wrong, the air block turns black, so you can see it from across the room. A reading has to hold for two measurements before it counts, so it doesn't flicker at a border. The message says what was measured, what it means, what to do and when. The numbers freeze the moment the alert fires.
Sent at once, even at 3 a.m.: heavy pollution, damp air, CO₂ from 1,500 ppm, a nearly empty battery.
Waits for morning: moderate pollution, CO₂ above your limit. You can switch off each kind of alert.
Commands: /status · /co2 · /air · /battery. The bot answers the next time the device is online.
Switch modes in the settings page with a single restart. If you leave your smart home for Wi‑Fi and come back, the pairing is still there.
Weather, forecast, clock and updates come straight from the internet. Alerts and commands go through your own Telegram bot.
It shows up as a device with every sensor. The hub sends the weather back, so each radio window is half as long. The settings page writes the automation for you: one paste.
Pairs with its own QR code and takes the time from the hub. Tested with Google Home. Weather and Telegram are off in this mode.
| Wi‑Fi | Wi‑Fi + MQTT | Matter | |
|---|---|---|---|
| Weather & 3‑day forecast | From the internet | From your hub | Off |
| Telegram alerts & commands | Yes | Yes | Off |
| Home Assistant device | Auto‑discovered | ||
| Matter hubs | CO₂, air, temp, humidity | ||
| Clock | Internet time | Internet time | From the hub |
| Needs Wi‑Fi | Yes | Yes | No |
No app to install. After three seconds the device prints its address and its own password on the glass. On your home network it opens as a page; without one it raises its own hotspot and shows a QR code. A first‑run wizard covers network, clock, weather and a tour of the screen.
The device checks that the air really was outdoor air before it writes anything to the sensor.
Type in what a reference thermometer shows and the device corrects itself.
Change an interval and the estimate recalculates on the spot.
Charts over any span, and a CSV export of everything recorded.
A ready automation with your topic, device and city already filled in.
Every area and every state, pictured by the same code that draws the glass.
Measure right now and redraw the whole screen cleanly.
Open the settings page. The light blinks three times to tell you it worked.
Switch off after a question on the screen. Press again to start. Nothing you set is lost.
* Estimated for the built‑in 2,000 mAh cell with night mode on, from wake‑up timings measured on the device. A long battery‑only test is running now, and measured figures will replace these.
Of the sensor wait is spent asleep. The device sleeps deeply between readings, and naps even while the sensors measure.
The display after dark. At night the frame freezes and the display's power is cut until morning. A press brings it back.
Honest charging. On the cable, the percentage rises only as fast as a real cell can charge. It doesn't jump when you unplug.
It says OFF. On e‑paper, a device that is off, one with a flat battery and one that has frozen all look the same. So this one says which it is.
No cloud stands between you and your readings. The device looks after itself.
The device talks to weather and update servers only. Readings stay on it, up to a year and a half of history.
Each device draws its own password and shows it on the glass when you need it. The password never crosses the network, because the page sends only a hash. Five wrong tries lock the page for a minute.
Updates arrive over the air, signed. A new version that fails its self‑test rolls itself back.
A security log sits in the settings page. Telegram tells you when the password changes, an update installs or a factory reset is requested.
A watchdog, a safe mode, sensor and bus recovery, a bypass for a stuck display, and a rollback after repeated failed starts.
The CO₂ calibration lives inside the sensor and survives even a factory reset. The gas calibration survives updates.