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'[PIC]: Easy ambient temp measurement'
2001\04\28@123344 by Graham North

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Hi all,

The project that I am currently working on requires me to measure the
ambient temperature.

I fancy using one of the Dallas IC's (or similar IC) to do this. I was just
wondering if anyone has used anything like this (think it was mentioned in a
recent thread). Does anyone know which is the easiest to interface as I am
up against a tight deadline. If anyone has some code to use such a device
that would be a great help.

Thanks

Garahm
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2001\04\28@141710 by Dale Botkin

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I have used the DS1620, which uses a 3-wire interface.  It's pretty easy
to talk to and it's cheap, but doesn't come in anything smaller than 8 pin
DIP package.  The 1820 is more accurate and smaller (TO-92), but more
expensive and uses a different interface protocol -- not quite as simple
to talk to, I've never tried it myself.

You could also use an LM35 or similar if you are usig a PIC with ADC.  I
played with one briefly, but not long enough to make it work reliably.  It
acts like a Zener with voltage that varies linearly with temperature.

Dale

On Sat, 28 Apr 2001, Graham North wrote:

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2001\04\28@143823 by Graham North

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Thanks for the advice Dale.

You would happen to have any code hanging around to talk to it would you?

Thanks

Graham
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2001\04\28@165457 by Dale Botkin

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Well, yeah...  http://www.botkin.org/dale/pic/thermo1/ds1620.h is what I
have used on one project.  It's ugly, and it's written for the CC5X
compiler (haven't had a chance to rewrite it yet), but it will show you
how to do the job.

Dale

On Sat, 28 Apr 2001, Graham North wrote:

{Quote hidden}

---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

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2001\04\28@193754 by Herbert Graf

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LM75, dead easy to set up and uses I2C which is very common and you should
be able to find code for it in about 30 seconds. TTYL

> {Original Message removed}

2001\04\28@200325 by Drew Vassallo

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Some of Dallas' chips have a one-wire interface... their protocol seems
pretty simple to me.  I'd check them out.

They're all pretty simple to use... just read the datasheets.

--Andrew
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2001\04\29@091117 by klpauba

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Check out http://www.phanderson.com for a ready-to-assemble temperature
reading kit.  You'll be helping out a group of interested college kids
too.

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2001\04\29@172951 by alshinn

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B G Micro has the LM34DZ (32 - 212 degF) and the LM35DZ (0 - 100 degC)
for $1.19 ea or 10/$9.00
These are 3 wire devices (Gnd, +5 to 12V, Analogue signal out)  --
10mv/deg(x)
order ph 800-276-2206
http://www.bgmicro.com/

For data, search Google with "lm34 temperature" or "lm35...
this will offer you the http://www.national.com
I have used

Looking forward:
Alan Shinn


Experience the
beginnings of microscopy.
Make your own replica
of one of Antony van Leeuwenhoek's microscopes.
visit    http://www.sirius.com/~alshinn/

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2001\04\30@064536 by BENEDICIC SAMO

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Hi!

I used Dallas DS1620, PIC16f84 and a Hitachi HD44780 based 2x16 LCD display
to measure room temperature and display it on LCD. It's 1/2°C accurate and
for now it only deals with temperatures, higher than 0°C. It's something I
work on currently, so in future I plan to control LCD in 4 bit mode, I'll
add routine that deals with negative values and improve accuracy to 1/10°C.
Regards,Samo

{Original Message removed}

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