Comments on: Recommend a Temperature Logger?

By: MARK P

MARK P — Tue, 19 Oct 2010 15:34:16 +0000

I ALSO AM INTERESTE IN A ONE WIRE CHEAP SYSTEM I HAVE A LOT OF TEMPERATURES TO LOG AND SOME CONTACT CLOSURES
WHAT IS A GOOD CHOICE?

By: UncleTomCobbly

UncleTomCobbly — Thu, 02 Jul 2009 10:54:23 +0000

iButtons are the way to do it, I’ve used them on and off for a number of years.
They are (almost) hermetically sealed I’ve thrown one into the washing machine before when it started playing up just to monitor the wash cyce.
There is also a humidity and temperature version it’s expensive, but actually very cheap when you compare it to other loggers.

Try carrying one on a keychain and you can monitor your movements during the day, it’s amazing what you can tell from variations in temperature provided you have a little extra data to correlate with.

http://www.dailyduino.com had a article on reading 1-wire DS1821 temperature ICs using an Arduino a few weeks ago, these are also a handy little sensor.

Search around for 1-wire interfaces you can make your own from simple parts or for development one-offs Maxim/Dallas samples several 1-wire interface parts. The free 1-wire software from Dallas will graph and setup the loggers using a simple UI.

By: Roughage

Roughage — Mon, 29 Jun 2009 18:18:32 +0000

These guys have been around for a number of years. I haven’t tried them, but they’ve managed to stay in business AND expand their product offerings:

http://www.onsetcomp.com/search/compare-products/U12-001-vs-U12-006-vs-U12-008-vs-U12-011-vs-U12-012-vs-U12-013

By: Keith Neufeld

Keith Neufeld — Tue, 09 Jun 2009 19:29:56 +0000

Bill, that all sounds great!

For my first batch, I really want to hang them from fishing line so they’re measuring air temperature, not bus frame temperature.

But assuming you want thermal conduction, is there any reason not to epoxy a magnet to them? Is there a surface where you could glue a magnet and still leave them able to go into the reader? Or is there enough ferrous material in them that a magnet will stick?

By: Bill

Bill — Tue, 09 Jun 2009 19:12:03 +0000

iButton’s are great. I have used them for the normal stuff but they are really fun for off the wall things like: Throw it under the hood of your car and watch the temperature spike after you park. Place one on the back of your TV and see how much time you are wasting (and who’s watching when you are away). Put a piece of black tape on one and throw 2 outside for an instant sunlight meter. Tape one to the cold water pipe coming in from the street and see when you using water….on and on…

Bill

By: Joe Zimmerman

Joe Zimmerman — Tue, 09 Jun 2009 15:00:04 +0000

I agree 100% on the iButton 1wire solution…

I’ve used mine for some interesting things in the past, and they are great.. You create a mission for them and tell them how often to log the temp, and they’ll do that for years if you want…

Downloading the data is quick.

You can interface with arduino if you want.

By: Bryan

Bryan — Mon, 08 Jun 2009 14:37:07 +0000

1wire + microchip

By: Slavo T.

Slavo T. — Mon, 08 Jun 2009 06:32:42 +0000

this not meet 2 channels, but 2 pcs will be below 120$.
http://www.microdaq.com/lascar/elusb1.php

By: Keith Neufeld

Keith Neufeld — Sun, 07 Jun 2009 16:40:36 +0000

Jean, I don’t find them available to sample. Also this is my end use, so I don’t feel good about sampling them as I do with parts for circuits I hope to turn into kits.

By: Bryon

Bryon — Sun, 07 Jun 2009 14:27:15 +0000

This place says they have most items in stock:

https://www.embeddeddatasystems.com/