In message 
          Nick Norman  wrote:

> On Fri, 28 Feb 2020 04:19:38 -0600, Richard Owlett wrote:

>> On 02/27/2020 12:23 PM, Dave Liquorice wrote:
>>> On Thu, 27 Feb 2020 09:08:45 -0400, Gregg Somes wrote:
>>>
>>>> Hi, I am trying to use a  2 lead thermistror (not a temp/humidity
>>>> sensor) with RPi 3B+.  Is it possible to wire this without a
>>>> breadboad?
>>>
>>> Pi's don't have any analog to digital convertors. The simplest solution
>>> is most likely to be a 1-Wire temperature sensor:
>>>
>>> https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf
>>>
>>> Plenty of code out there to work with them (and many of the other
>>> 1-Wire devices).
>>>
>>>
>> One wire?
>> BULL! I quote the referenced pdf "... one data line (and ground)". And
>> as a PRACTICAL point you need another wire to power the device.
>> That makes it a *THREE* wire device.

> They|some can be 'parasitically' powered from the data line's pull up ...

> so one wire ... and a ground that is everywhere - ish :-)

> Avpx

- as in DS18B20, parasitic temperature chip, most easily used as a 3-pin
TO-92 package...


--
Mark J
From RISCOS 5.27 on a BeagleBoard-xM and Raspberry Pi2B
- and Linux on a PandaBoard ES, Raspberry Pi3B+ and Pi4B

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