Comments on: TEMPer1 temperature sensor in Linux

By: dr memals

dr memals — Tue, 05 Mar 2013 17:56:10 +0000

Love the way your code just works!
Had a small issue that plugging it directly into my Raspberry Pi caused it to show the temp + 10 degrees. The Raspberry Pi was not over heating but was running warm, a small 50cm USB cable fixed that.
I graphed the results with gnuplot.

#!/usr/bin/gnuplot
set term png size 1200,800 enhanced font ‘/usr/share/fonts/liberation-fonts/LiberationSans-Regular.ttf’ 12
set xdata time
set timefmt “%d-%b-%Y %H:%M”
set output “/home/USER/temp/room_temp.png”
set grid
set xlabel “Time”
set ylabel “Temp”
set title “Room Temp”
set key left box
set datafile separator “,”
plot “MYCSVFILE.csv” using 1:2 title “Office Temp”

By: Pongamorn

Pongamorn — Mon, 04 Feb 2013 13:00:49 +0000

thank you, you saves my day

By: Alex Atkin

Alex Atkin — Thu, 31 Jan 2013 15:28:49 +0000

Just compiled this on Fedora 18, works like a charm.

The only thing is every so often I get “libusbx: error [op_open] open failed, code -1 errno 19″ which is annoying.

I presume this is coming from the library itself and can suppressed by running the command as “./temper 2> /dev/null”.

I was wondering, when it has problems probing the sensors, is there a good reason you chose to wait 3 seconds before trying again or could that be reduced?

I am wanting to use this for a near real-time display of the temperature outside so would like to reduce the delay as much as possible.

By: Gaz Davidson

Gaz Davidson — Tue, 27 Nov 2012 14:01:38 +0000

Yep should do, my USB extension cable is about 3 metres. If it doesn’t work then you may need to stick a powered hub in the middle, which would suck.

By: Gary

Gary — Thu, 15 Nov 2012 02:52:23 +0000

First, thanks, this code / procedure worked fine. Question: I need a longer wire on one of them so I can put it outside my house (in a place where rain won’t get at it). Adding an extension USB cord should be fine provided I keep it less than 5m long?

By: Gaz Davidson

Gaz Davidson — Sun, 07 Oct 2012 14:02:44 +0000

@Andreas, those temper devices don’t have any sort of unique ID, so the order may switch around when you reboot your machine.

If you can be sure of the order it shouldn’t be hard to just choose the second one instead of the first, hack “find_lvr_winusb” and make it choose the second device found instead of the first, then just run two binaries.

If you do it properly and refactor it to allow more than one device at a time, please send me a pull request and I’ll merge.

By: Andreas

Andreas — Tue, 25 Sep 2012 22:09:08 +0000

works like charming, thank you. Any hints how to handle two devices? I want to log flow/return temperatures of my boiler.

Kind Regards
Andreas

By: Thomas

Thomas — Tue, 04 Sep 2012 09:15:04 +0000

Hello,

this helped me a lot!!! Thank you!

By: Bubbler: Monitoring homebrew CO2 production using arecord and Python – bitplane.net

Wed, 08 Feb 2012 21:14:59 +0000

[...] all that it appears to work okay. Here’s a graph that shows it in action along with my thermometer, the dip is caused by me dismantling it while taking the photos [...]