Ethics aside, are they accurate enough for e.g. home brewing or fishtank usage, compared to parellax reading error on a traditional mercury/alcohol thermometer?
Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
21–30 of 239 posts
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#22Counterfeit chips are a huge problem, these days.
I suspect that a significant number of Bluetooth chips are fake; even in very expensive kit.
I got tired of having expensive headsets croak after less than a year, while my cheap 20-dollar exercise headsets lasted for four years.
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#23Anyone have an idea what these are used in? I originally thought they might be used for 3D printing, but that doesn’t seem to be the case - except, perhaps for chamber temperature.
I just bought a bunch of cheap indoor/outdoor weather sensors, I'd imagine they might apply.
May I ask what you bought? I've been looking for something like this but everything I've found has been pricey.
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#24This affects temperature sensors/parts bought from un-official distributors like ebay or AliExpress, not digikey, farnel, etc. Perhaps I've been too lucky in my career and practiced EE for work, but who would you ever go to ebay instead of digikey?? Digikey certainly has a premium, but their speciality is small numbers/cut tape/etc and they have a small order size which makes them ok for hobby work, and I've used the…
I've often bought parts from aliexpress because they're available for Sparkfun and adafruit deserve commendation here, as their designs are open enough to even have low effort clones work reasonably well. (I'd buy a legit version if I was doing something professional, but prototyping for the sake of research is a different story)
I'm a special case though, since deliveries from the local AVNET subsidiary to my employer are often comped due to volume/location.
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#25Wow, I am pretty sure I had some of these, parasitic power would NOT work, I had it on a scope and everything. What a pain in the butt that was! Why not just give these mostly cloned parts their own honest name and part number?
Why not just give these mostly cloned parts their own honest name and part number?
Judging by what the page says, they do --- but someone down the line from the manufacturer remarks them to DS18B20s.
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#26This affects temperature sensors/parts bought from un-official distributors like ebay or AliExpress, not digikey, farnel, etc. Perhaps I've been too lucky in my career and practiced EE for work, but who would you ever go to ebay instead of digikey?? Digikey certainly has a premium, but their speciality is small numbers/cut tape/etc and they have a small order size which makes them ok for hobby work, and I've used the…
I'd never expect to find these in official products from trusted brands, but off-brand crap? Oh yeah. DIY kits? Absolutely. The parts drawer at the makerspace? One hundred percent. So much stuff on eBay is free shipping, that's huge when you only need a few dollars worth of stuff. If I could convince Digi-Key to lick a 55-cent stamp when I need ten of something, instead of charging me $7 for shipping, I'd have a lot…
There will be no licking of 55 cent stamps. US stamps have been 100% self-adhesive since 2016ish.
The envelope is of course another matter.
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#27Counterfeit chips are a huge problem, these days. I suspect that a significant number of Bluetooth chips are fake; even in very expensive kit. I got tired of having expensive headsets croak after less than a year, while my cheap 20-dollar exercise headsets lasted for four years.
Chips have a higher value on a BOM, and as such have more financial incentives to be reverse-engineered and counterfeited. This is a bit more interesting since it's a sensor that has several operating parameters that "sort-of" send expected data back, but depending on the operational characteristics could need to be recalled entirely.
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#28Ethics aside, are they accurate enough for e.g. home brewing or fishtank usage, compared to parellax reading error on a traditional mercury/alcohol thermometer?
depends on what fake you get, based on the linked article. seems like for the most part yes
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#29Earlier quoted context omitted.
I just bought a bunch of cheap indoor/outdoor weather sensors, I'd imagine they might apply.
May I ask what you bought? I've been looking for something like this but everything I've found has been pricey.
Ecowitt everything. They whitebox for Ambientweather and others, there's a whole rundown on wxforum:
Re: Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
#30Counterfeit chips are a huge problem, these days. I suspect that a significant number of Bluetooth chips are fake; even in very expensive kit. I got tired of having expensive headsets croak after less than a year, while my cheap 20-dollar exercise headsets lasted for four years.
Chips have a higher value on a BOM, and as such have more financial incentives to be reverse-engineered and counterfeited. This is a bit more interesting since it's a sensor that has several operating parameters that "sort-of" send expected data back, but depending on the operational characteristics could need to be recalled entirely.
Especially if they are to be used for something like monitoring for excessive heat in some kit that could catch fire.