I’m looking for a cheap and good Wi-Fi or ZigBee Carbon Monoxide (CO)-Sensor for home assistant, any advice?
I have found this looks like is partially working
https://it.aliexpress.com/item/1005004509406130.html?src=google&aff_fcid=5e1dad5cb17643fa87f519372e67b045-1708679084393-00910-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=5e1dad5cb17643fa87f519372e67b045-1708679084393-00910-UneMJZVf&terminal_id=ba2b0aac52ea4843b9c01bb6e4d405b6&afSmartRedirect=y
Hi,
If this is for safety-critical monitoring (say, of a gas appliance), DON’T. Many countries and insurance companies require BY LAW very specific CO sensors, and although there are automatable sensors out there (and for fire), very few have any form of certification making them no better than expensive toys.
Even Google Nest Protect fire / CO sensors are not legal in Scotland.
There are CO monitors available with other air-quality measures for “information” purposes. Many PCB modules are available with PM2.5 and CO from the likes of Adafruit, and some ready-made air-quality sensors are out there.
Even IKEA makes an air-quality sensor VINDSTYRKA (PM2.5) that started out not connected (LEDs only), then after being hacked a lot (ESPhome), was replaced with a connected version (think it is Zigbee, PM2.5 + VOC, not CO).
The sort of sensors from the usual on-line market place are pretty crap - e.g. claim to measure (say) O2 but breathing on them gives such a wide measurement swing that either the sensor is crap / blinded by moisture / measuring something else entirely / you are dead!
Think Big Clive did a tear-down of such a sensor on YouTube.
James
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I have one of these, and wouldn’t recommend it. I have the Zigbee version. It doesn’t work out of the box. I wrote a custom quirk for ZHA. It works, but it’s tearing my whole network apart. Way too frequent updates. Multiple other Zigbee devices around it go offline. Removing it from the network doesn’t help either. I need to unplug it from power. It’s basically a 3-in-1: CO alarm, CH4 alarm and a Zigbee signal blocker 
This is the firmware behavior of almost all Tuya based devices. I warn people constantly to not fall for the Tuya trap all because they are cheaper and plentiful. They are designed badly in terms of zigbee behavior and lack of parameter adjustments, and not worth the headache once they start wrecking your network.
Maybe… And I agree that Tuya is the worst you can get… Although I have a dozen of Tuya Zigbee devices (sensors, led controllers, valves, trvs, plugs…), and this is the only one causing any problems. They are crap, but you can’t beat them on price. The ones that die, I replace with Aqara mostly. Not much better, but better, and the price reflects it as well.
I’m still trying to fight this stupid sensor. My quirk seems to work, and now I’m trying to reduce the chatter with zha-toolkit. I’ll post if I manage to get it stable.
The interesting thing is that I had this device working for a few months. Then after a ZHA update, all hell broke loose. Devs at ZHA claim that no changes that were made could cause this, but it started to completely destroy my network. All devices had gigantic delays (multiple minutes), if they worked at all. Unplugging this crap reverted everything back to normal. I gave up on it, and just put a dumb CO alarm. Then after a year that sensor went dead, so again, I’m trying to get this Tuya crap to work. Some people call it masochism
I finally solved my problem buying X-Sense SC07-WX
they have their own integration with home assistant that is working
Hi,
This looks like a cool product.
Where did you find the X-Sense maintained HA integration? I have been searching, but all I have found is a community-maintained integration on HACS. Is that the only one available?
Thanks!
I like the fact that they explain Home Assistant on there website. They also mentioned the un-official HACS integration
I recently contacted x-sense and asked…
Looking for a CO wireless detector,.. that will communicate with Home Assistant,.. i.e. no hub box'
they responded back with the following:-
Thank you for reaching out with your specific requirements for a CO detector.
We would like to inform you that our current range of CO detectors does not support direct integration with the Home Assistant platform. We have carefully noted your request for this functionality and will forward it to our product development team for consideration in future updates and services.
For now, our devices are designed to operate primarily within our own ecosystem using their dedicated app and, where applicable, a base station for extended interconnectivity.
We appreciate your interest in X-Sense and thank you for the feedback, which is invaluable as we work to enhance our product offerings.
Should you have any other questions, please feel free to ask.
Does anyone know of a device that does ‘fit the bill’,… ie a proper CO detector that does natively talk to HA…
KR