temp data logger

Zivjo,

potrebujem večkanalni data logger za merjenje temperature. Zadeva naj bi bila priklučena na PC non stop in zajemala podatke. Potreboval bi cca 14 kanalov.

Mislim da je tole taka zadeva, ki jo potrebujem, vedar samo 4 kanalna. Najbolje bi bilo če bi lahko zadevo sestavu sam oz da zvem kako se jo sestavi, udejstvovanje pa prepustim kakemu električarju

Mi lahko kdo svetuje, kaj bi potreboval?

lp

Eh, če bo zadeva stalno priključena na PC sploh ni treba mikrokontrolerja.

Nabaviš teh DS1820 kolikor rabiš in jih priključiš na serijski port (vezje vsebuje 3 diode in 2 upora). Pol pa raje na PCju spraviš skupa program, oz. poiščeš že narejenega.

Za nezje mam nekje shemo, bom poiskal.

Hvala obema za odgovor. BluPhenix, se priporočam za načrt, ja

Hvala lepa! Vezje je v izdelavi :)

lp

Koliko metrov pa to "nese"?

To nese tudi precej več, če nimaš napajanja po podatkovnem kabli, torej če maš poseben vod za napajanje in je generator lociran blizu senzorja. Zadeva ima tudi 64 bitno CRC check kodo, tako da ni varjante, da bi dobil napačen podatek (lahko ga samo dobiš malo pozneje).

Te senzorje npr uporabljajo v stoplnicah za kontrolo temperature posameznih odsekov stavb in podobno, recimo v skladiščih tovarn. Tako da gre verejtno tudi na več kot 30m.

Se neki infota...

ne uspe mi v winsih zalaufat tega... ne najdem ustreznega programa.

Tole je pa še en za dos..


DigiTemp v1.7 Frequently Asked Questions
Copyright 2002 by Brian C. Lane www.brianlane.com

Q. Where Do I buy Parts?
www.ibutton.com sells the DS9097U-009 for $10 as of this writing. Go
to their online store and look for the Serial Port Adapter Section.
Click on the 'Blue Dot and One Wire Connectivity'

I order my temperature sensors directly from Dallas Semiconductor
at 1-800-336-6933 (http://www.dalsemi.com/sales/credit_car...

They also have the old style adapter that DigiTemp v1.4 uses available
as part #DS9097 or DS9097E described as passive adapters.

DigiKey as all of the parts needed to build the passive adapter. See
the HOWTO.TXT document for DigiKey part numbers.

Q. How do I connect it to the RJ-11 of the DS9097-U
Take a look at the DS9097-U data sheet at
http://www.dalsemi.com/datasheets/pdfs/...
Ground is the pin on the right and data is the pin on the left (using
the two center pins of the RJ-11).
Even with this information you will probably get it backwards the first
time so make a temporary connecting the first time and confirm that
you have the correct polarity.

Q. How many can I connect?
Read the Dallas Semiconductor Tech. Brief on the One Wire Network.
http://www.dalsemi.com/techbriefs/tb1.h... it covers everything you
want to know and more. The limit comes down to wiring, how much you
have and how good it is. Other than that you can connect as many as
you need.

Q. How long can the wire be?
Again, read the Tech. Brief above. This depends on the cable. Using
better cable will allow you to extend the cable longer distances.

Q. I have glitches in my data, what do I do?
The first solution is to check all of your connections to make sure
they are soldered or well connected.
Next, is your cable decent quality? Cat-5 is the best, with twisted
telephone cable coming in second.
If you are still having problems you should try Using a Schottky
diode across the cable's end. Connect the diode reverse-biased with
the cathode (the stripe) on the data line and anode on the return.

I used a 1N5818 across my attic sensor -- before adding this I was
getting multiple glitches per hour. Now I have seen 1 glitch in
about 2 weeks.

Q. What is the difference between the DS9097-U and the App. Note 74 type
of adapter.
The DS9097-U adapter uses a serial port to 1-wire conversion chip that
makes talking to the 1-wire network easier. DigiTemp v2.x uses this
type of adapter (the DS9097U-009 and -S09 both work fine).

The old style of adapter (sometimes called passive or App. Note #74)
used only diodes and resistors to convert the serial port voltages to
the one-wire voltages. Dallas still sells adapters of this type, part
number DS9097 and DS9097E that is built on this design. DigiTemp v1.x
supports this type of adapter, and include a HOWTO document with
instructions for building your own.

Q. Which 1-wire temperature sensors are supported?

DS1820
DS18S20
DS18B20
DS1822
DS1920

Q. Are 1-Wire HUBs supported?

Yes, DigiTemp v2.3 for Linux added HUB support, and v1.7 for Windows
added HUB support to the windows branch of the project. HUB support
is planned for DigiTemp v1.7 for Linux, as well as a tray icon version
for Windows.

Še več! :)

Azrael: Na LPTju sem zdej

Oziroma majo na dallasovi strani SDK (software development kit) za 1-wire protokol in razne primere - tudi za ds1820 : http://www.maxim-ic.com/products/ibutton/software/1wire/wirekit.cfm

Sej ni nič narobe. Pač od 440x kolikor ti je prebralo temperaturo, se je zgodila napaka v prenostu, to je CRC error. Sej lepo kaže temperaturo.

Sem že napisal, če rabiš samo za en senzor imaš dallasov program iButton, ne vem pa če podpira več senzorjev, ker nisem probal ampak se mi zdi da bi moral podpirati več 1 wire elementorv. Link do programa sem podal zgoraj.

Zgleda pa nekako takole:

Sem probal, ne dela.

Pri inštalaciji drajverjev me upraša kater port bi rad uporabljal. Poizkusim sem vse. no-go

Potem smo odkrili tezavo.. ok.

Hvala še enkrat.

IC elektronika, se mi zdi :)

V HTE ga imajo za 4€. Sicer ga ni na ceniku, ampak jih redno kupujem v HTE Lj.

ds18s20 = ds1820 ja.

kulSMS svetujem ti, da še enkrat prebereš temo. Več senzorjev daš kar skupaj, enega paralelno k drugemu.

Ne vem če sem zadel ampak sem tudi sam izvedel podobno zadevo - nekoliko bolj komplicirano brezžično.

DS18B20 - PIC1 - oddajnik

sprejemnik - PIC2 - RS232 - PC

Stvar funkcionira zaenkrat z enim senzorjem lahko pa jih priključiš tudi več!

LP