Wi-Fi or ZigBee Carbon Monoxide (CO)-Sensor

Hardware
1

I’m looking for a cheap and good Wi-Fi or ZigBee Carbon Monoxide (CO)-Sensor for home assistant, any advice?

2

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

3

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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