New subject: usb thermometer?

22 Jan 2020


      Regarding power,
You might consider doing poe (power over Ethernet)
Excuses for auto-typo’s
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On 21 Jan 2020, at 23:42, David King dave@daveking.com wrote:
On 1/20/20 2:17 PM, ToddAndMargo via users wrote:
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On 2020-01-20 09:03, David King wrote:
On 1/20/20 1:08 AM, ToddAndMargo via users wrote:
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Hi All,
Is there a such thing as usb thermometer that Fedora
can read?  And be able to be place a ways away from
the computer so the computer's heat will not throw
it off?
It's not USB-based like you asked for, but I wanted a temperature and
humidity sensor I could place anywhere in the house and which could be
read by my computer.  My solution was to buy a Raspebrry Pi 3 Model B+
and a humidity sensor that plugs into its IO pins.  That's ~$40 total
cost.  Now I have a little computer that reads the temp and humidity
anywhere I put it (it communicates via my wifi) and makes those readings
available through a web service on my home network that any other
computer can query.  I could provide more details if this interests you
(outside the list, as this would be way off-topic for this list.)  It's
pretty simple to do, simpler than the web tutorials I found make it out
to be.  They're all pretty out-of-date when it comes to the software
setup involved.  That's gotten dead simple now.
Dave
David King
dave at daveking dot com
Not what I was after, but I am interested anyway.  I
have had plumbing lines leak under the house before.
How do you keep it charged?
This humidity sensor I'm using is for relative humidity in the air, not
for water leaks.  There are probably better wireless water leak
detectors out there.   To answer your question, the Raspberry Pi isn't
battery powered but I suppose it could be.  They run off USB power,
i.e., 5VDC at various amperages depending on the model.  The one I'm
using for this application needs 2 amps.  I run it off an extra cell
phone charger I had laying around.  So, I assume one could probably use
one of those mobile phone charging backup batteries that are on the
market to make it battery powered.  Not sure what the run time would be
on one of those however.
I just made a post on my wiki describing what I built ->
http://bit.ly/37hOLu6
Dave
David King
dave at daveking dot com
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Re: usb thermometer?