Re: Small thermometer... Probably digital



J

Jim Ford

Guest
* The air of uk.rec.walking was filled with the delicate perfume
* of violets, as RzB <[email protected]> descended on
* a shaft of golden sunlight, and announced:

> I have scoured the web and outdoor shops for a small,
> light, reasonably accurate thermometer. I would just like to
> know what the temp is when we are out walking...

Have a look at the Dallas/Maxim iButton DS1920. They're about the size of a
large watch battery and are a complete temperature datalogger. They're also
cheap - only a couple of quid IIRC. You use the free software and a cheap
(or homemade) interface to your computer to program it. You can set the time
it starts logging and the logging rate. It's also waterproof. You can set it
up at home to start logging at the start of your trip and clip it to your
rucksack. At the programmed start time it will start logging temperatures.
When you get home, you can download the data and plot it! _Much_ more techy
than a GPS!

There's lots of info on the net, but here's a start:

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2818

On the Maxim site, you can ask for samples and they'll send yoi a couple free!

Jim Ford
 
* The air of uk.rec.walking was filled with the delicate perfume
* of violets, as Jim Ford <[email protected]> descended on a shaft
* of golden sunlight, and announced:

> Have a look at the Dallas/Maxim iButton DS1920.

Also the DS1921 (I think this is the one I've used)

Jim Ford
 
I noticed that Message-ID: <[email protected]> from Jim
Ford contained the following:

>
>> Have a look at the Dallas/Maxim iButton DS1920.
>
>Also the DS1921 (I think this is the one I've used)

Looks complex. Presumably this needs power supply, interface etc?

--
Geoff Berrow (put thecat out to email)
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
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* The air of uk.rec.walking was filled with the delicate perfume
* of violets, as Geoff Berrow <[email protected]> descended on a shaft
* of golden sunlight, and announced:

>>> Have a look at the Dallas/Maxim iButton DS1920.
> >
> >Also the DS1921 (I think this is the one I've used)
>
> Looks complex. Presumably this needs power supply, interface etc?

No battery required - it's built-in. Literally, the iButton is about the
size of a pound coin and is a complete, self contained data-logger. The only
interface you need is a cheap or homemade one to an RS232 serial port to set
it up and download the data. It's also weatherproof, so you can leave one on
a hillside, happily logging away for a year, retrieve it and download the
data. Amazing device for a couple of quid!

Jim Ford
 
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