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

--
'You've got the loudest silences I ever did hear from anyone who wasn't
dead!'
(Lords and Ladies)
15:15:01 up 17 days, 19:05, 8 users, load average: 0.69, 0.84, 0.67

--- SoupGate-Win32 v1.05