Clarification on "Obtained neither probes nor chips in 2019"

cpetrich / counterfeit_DS18B20

How to tell original from fake DS18B20 temperature sensors.

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Clarification on "Obtained neither probes nor chips in 2019" #13

Closed sethtroisi closed 4 years ago

sethtroisi commented 4 years ago

From Obsolete as of 2019

Obsolete as of 2019 Obtained neither probes nor chips in 2019

ROM patterns [5,7]: 28-tt-tt-ss-00-00-80-crc Example ROM: 28-9E-9C-1F -00-00-80- 04

I purchased several probe from Amazon in May 2016, When I run classify_fake_DS18B20.ino I get

28-28-2D-28-00-00-80-FD: (Could not identify Family.)

This doesn't quite match the obsolete pattern or the good pattern; I'm assuming this means I have a counterfeit probe but not one that you've seen?

cpetrich commented 4 years ago

Yes, your -00-00-80-'s are counterfeit, and yes, I wasn't able to purchase those last year no matter how hard I tried: I always ended up with (probes containing) Family D2 sensors.

If you have spare probes with -00-00-80- sensors that you are happy to send me then I'll have a closer look to see where they fit in -- may be of historical interest and could give context for what we're dealing with today.

sethtroisi commented 4 years ago

@cpetrich I found a number of extras. If you send me an address (you can email me at sethtroisi@google.com) I'll post them to you.

cpetrich commented 4 years ago

Much appreciated!