Re:Infineon's CO2 Sensor Monitors Indoor Air Quality
by ale42 on Saturday September 21, 2024 @05:14PM
(#41612716)
I'm not sure I would source non-Chinese electronic components from Aliexpress... (unless it's just to play with them, definitely not for a product): you might need to check their reliability and quality. Pretty sure that Sensirion themselves are not selling there, so they are probably either clones, fakes, recycled ones, or if you are lucky authentic ones that for some reason ended up there (but I can't imagine a way).
[ Parent
| on HN ]
Re:Infineon's CO2 Sensor Monitors Indoor Air Quality
by throwup238 on Saturday September 21, 2024 @10:16PM
(#41614174)
> or if you are lucky authentic ones that for some reason ended up there (but I can't imagine a way).
Chinese fabs are notorious for running secret shifts that make their customers’ chips to sell themselves. They’re the exact same chip but made without authorization, using the customer’s exact design.
That said, Sensirion has their own CMOS fabs in Switzerland so that’s very unlikely to be the case here. If they work at all, the counterfeit chips are probably some Chinese CO2 sensor IC that's small enough to fit into the same package, lightly customized to fit the pinout of the original. Or it's just a microcontroller inside faking it a la FTDI.
Re:Infineon's CO2 Sensor Monitors Indoor Air Quality
by tobi1449 on Monday September 23, 2024 @05:45AM
(#41624207)
Huh, good points.
It doesn't seem to be just a micro sensor faking it, as it reacts as expected for example when opening the windows.
I guess the only way to tell if they are any good is to buy a verified good CO2 sensor and compare the outputs then.