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Waterproof thermometer

 
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sbeausol
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Joined: 26 Mar 2008
Posts: 3

PostPosted: Wed Mar 26, 2008 12:00 pm    Post subject: Waterproof thermometer Reply with quote

I am looking to build a thermometer to measure temperatures at different depths in a lake in reel time on an LCD. As many of you are aware there are tons of thermometer type application/circuit examples on the net. I'm pretty sure the basic design will be battery powered and contain a temp probe on a spool of wire which i will send out to specific depths and take a reading (would love a wireless application but the whole sonar thing might be a bit too complex). This is more than likely a one-time application for something that is really expensive to buy off the shelf (if you can find one). My goals are to come up with a cheap, easily reproduced custom solution.

The problem of course is that i'm a total newbie. I've read several of the projects people have posted, but i still find myself missing some of the critical basic info i need. Where should i start with circuits and programing chips? what microchip should i use? Is there a book i should buy, an online tutorial? I am competent with a soldering iron, and have some decent understanding on electronics etc. I am simply looking to acquire enough knowledge to do this project myself.

Any help/input is greatly appreciated.
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Wed Mar 26, 2008 5:37 pm    Post subject: Reply with quote

I think this is exactly what you are looking for. You can buy it as a kit or make your own.
http://quozl.netrek.org/ts/

You could have 4 of these sensors at various fixed depths (say 10 feet apart) then raise and lower the string of these to read the data at many depths at one time.
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sbeausol
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Joined: 26 Mar 2008
Posts: 3

PostPosted: Thu Mar 27, 2008 10:22 am    Post subject: Reply with quote

good idea... my question would be how difficult would it be to drop the serial port for a power supply and an lcd?
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Mar 27, 2008 11:25 am    Post subject: Reply with quote

sbeausol wrote:
good idea... my question would be how difficult would it be to drop the serial port for a power supply and an lcd?


It wouldn't be that hard, you could make a controller that just read in the data every few seconds and have it simply output that to a display. You would not have the data for later analysis though...
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sbeausol
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Joined: 26 Mar 2008
Posts: 3

PostPosted: Thu Mar 27, 2008 12:21 pm    Post subject: Reply with quote

i here ya, i'm just concerned about bringing a laptop on a boat! Then i have to power the laptop as well, which would be irritating
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Mar 28, 2008 10:39 am    Post subject: Reply with quote

sbeausol wrote:
i here ya, i'm just concerned about bringing a laptop on a boat! Then i have to power the laptop as well, which would be irritating


I have never done any work with PDAs but most of them have a way of reading serial data, that might be another way that you could have something inexpensive to record and display your data. I have seen some of the older Palm PDAs going for $20 at some of the discount stores.
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Nginuity
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Joined: 13 Nov 2006
Posts: 224
Location: Dallas, Texas

PostPosted: Fri Mar 28, 2008 11:49 am    Post subject: Reply with quote

Yeah, I have one such Palm 7x that isn't getting any use. If it werent such a pain to develop in the Palm OS, I might use it more Smile
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Mar 28, 2008 11:22 pm    Post subject: Reply with quote

Nginuity wrote:
Yeah, I have one such Palm 7x that isn't getting any use. If it werent such a pain to develop in the Palm OS, I might use it more Smile


I heard the same thing about programming those things... It would be cool to have a data acquisition program or something on one though. I wonder if the pocket PC devices would be easy to program for something like that?

Here is an interesting article about how to use a Palm Pilot for data acquisition. Looks not bad...
http://www.picotech.com/applications/palm.html

Even on Ebay the older palms are CHEAP!!!
http://cgi.ebay.com/3COM-PALM-PILOT-M105-8mb-WITH-STYLUS-PDA-TESTED_W0QQitemZ160223210160QQihZ006QQcategoryZ38331QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

If only I had a bit more time, I feel like doing some playing with my old palm now.
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Nginuity
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Joined: 13 Nov 2006
Posts: 224
Location: Dallas, Texas

PostPosted: Sat Mar 29, 2008 11:42 am    Post subject: Reply with quote

I see what you mean. The only issue I can see, is that the internal capacity of the old Palm units is not very high.
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BronzeG3
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Joined: 30 Apr 2006
Posts: 134

PostPosted: Tue Apr 01, 2008 9:39 am    Post subject: Reply with quote

You could always add an EEPROM to the circuit. Assuming 16 bits of data per reading, a 1Mbit EEPROM can store over 60,000 readings.
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