Am 03.08.19 um 22:57 schrieb Mick Sulley:
> I recently bought 4 DS18B20 sensors from eBay.  When I received them
> they did not work, that is they did not show up on the bus when
> connected to a DS9490 USB adapter.  I reported it to the seller and got
> a refund.  I then ordered 10 from another seller on eBay, just tested
> those and none of them work.  I have tried testing a known good sensor
> and that shows up as expected.
>
> Have I just been unlucky?  Has anyone else bought sensors which do not
> work?  Can anyone recommend a supplier whose sensors do work?
>
Does the DS2401 iButton inside the DS9490 adapter show up? Chances are
you blew up the DS9403 protection diode or the EMI choke in the GND line.

Kind regards

        Jan


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