Re: help with temp display for my Unimog

On a sunny day (Wed, 20 Dec 2006 15:38:39 -0800) it happened "Paul Hovnanian
P.E." <paul@xxxxxxxxxxxxx> wrote in <4589C97F.4DFAD523@xxxxxxxxxxxxx>:

But why use thermocouples? there are many nice i2c temp sensors.

The OP was using thermocouples and he might not want to change.
Thermocouples can handle about any temperature one is likely to find in
an engine. I'm not so sure about the sensors with integrated
electronics. Once he figures out how to build one thermocouple module,
that will suffice for everything.

Yes, been thinking about that, he has those but the interface is more complicated,
small signals (see below too).
If he just wants carter temp and gear temp, then he could pehaps glue some i2c based
sensors or even si diodes (those work great as temp sensor, I fixed my washing machine
temp sensor by replacing it with a bit of electronics and a si diode), i2C would directly
interface to for example a par port.


Like I use here:
ftp://panteltje.com/pub/mirror_plus_temp.gif

Display of my home (heater) control system.
Now aint't that cool?

It also tells you how much you recently spent on kWh.

Is that 10.48 Euro perday, per kWh or since the last billing period?

Since I started it, some weeks ago, because of the extreme warm weather for November
no heating was needed really.
The equipment by itself is always good for +10 degrees centigrade over outside temp,
so when it drops below 10 degrees outside I switch the thing on (switched it off in March).
A kWh now goes for 6.21 cent last time I looked (excluding taxes).
The system, apart from controlling on / off, also measures current, and calculates with that.
Also had it running on manual some time, so that did not count, indeed went to computer
after I payed the bills for this year.
It turned out to not so much as aI feared :-)

The display is written using xforms in Linux.
http://savannah.nongnu.org/projects/xforms#options
Xforms has a GUI generator (fdesign) that can generate C code....
Takes less then half an hour to make a little GUI interface like that.
It has pretty good graphics widgest too.
(Well you still have to write the drivers and build the hardware to get
those temps hehe).

But the tools are there. If one needs a non-laptop solution, there are
some one board systems with quarter VGA touchscreen displays. The app.
developed on one's desktop can be moved over with (almost) no effort.

Sure.
On point : if you want to use an USB webcam, then in case of the car you may run into
cable length problems?
I do not know what exactly the max USB length is.
I bought an analog color camera module for this:
http://www1.nl2.conrad.com/conrad_nl/layout2/detail.fh?fh_secondid=b2c150026&fh_view_size=50&action=search&fh_start_index=50&fh_eds=%c3%9f&xfh_view=search&fh_sort_by=&fh_host=www1.nl2.conrad.com&fh_session=%2fscripts%2fwgate%2fzcop_nl2%2f~flN0YXRlPTMwNzAzOTUzOTc%3d&fh_session=%2fscripts%2fwgate%2fzcop_nl2%2f~flN0YXRlPTMwNzAzOTUzOTc%3d&fh_location=%2f%2fb2cconrad_nl_b2c%2fnl_NL&fh_search=CMOS+camera+module&fh_refview=search
You should expect up to 5 to 10 meters cable in a car....
I bought it for the motorbike, but it ended up in the front door of the house..

.

Relevant Pages

  • Re: Measuring refrigeration power draw.
    ... A Hobo 12-012 data logger with internal temp and RH sensors and 2 external ... They actually use less amp hours when they run 90% of the ...
    (rec.boats.cruising)
  • Re: X takes up a lot of memory
    ... i installed nvidia drivers and now the problem ... in the terminal when i enter sensors i get ... Adapter: PCI adapter ... Core0 Temp: +49.0°C ...
    (comp.windows.x.kde)
  • Re: Heat Sensors?
    ... Get an alarm co out, my heat sensors are only in the kitchen and near ... the boiler, mine activate at a high temp, I forget the temp but it might ... sensors are common in dusty areas or kitchens where false alarms would ...
    (alt.home.repair)
  • Re: Help: Machine says its running hot
    ... The first time, I shut down the machine, check thed the ... >The second time I just restarted to the BIOS to check the temp again ... sensors.conf - libsensors configuration file ...
    (Fedora)
  • Re: help with temp display for my Unimog
    ... Thermocouples can handle about any temperature one is likely to find in ... I'm not so sure about the sensors with integrated ... temp sensor by replacing it with a bit of electronics and a si diode), ...
    (sci.electronics.design)
Loading