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[OT] 433MHz remote measurement modules

 
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kender



Joined: 09 Aug 2004
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[OT] 433MHz remote measurement modules
PostPosted: Thu Aug 23, 2007 6:18 pm     Reply with quote

My question is not directly related to PICs. I’m posting this question here, because you, guys, have seen a lot of instrumentation in your travels.

I’m looking for a wireless remote measurement system that communicates at 433MHz or lower frequency. FCC compliance is not a problem, because it will be working only for one month, and it will be shielded from the outside world by a chainlink fence.

The purpose of the system is to measure and transmit gas pressure few times a minute for a month. The range is 50 to 100 meters. 4 to 6 units per base station. Of course, I can add my own pressure sensor to a system that has an A/D.

There's a hard requirement that the device shuold be small – smaller than a 9V battery

I guess, I could put such system together myself, but I’ve got a very short notice, and I will need to field this system very soon.

Could anyone recommend?

Thanks,
Nick

P.S. ...back to web search.
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Last edited by kender on Sun Aug 26, 2007 12:11 pm; edited 1 time in total
Neutone



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PostPosted: Thu Aug 23, 2007 8:15 pm     Reply with quote

Measurement Computing make a USB stick that is a data logger. It's not wireless and I have never used one but it looks like it will log the data you are talking about.

USB-503http://www.measurementcomputing.com/pdfs/usb-503-data-sheet.pdf
kender



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PostPosted: Thu Aug 23, 2007 8:20 pm     Reply with quote

Neutone,

Thanks, that't a very neat logger to have in a toolbox. I am considering a logger a a design path. The problem is that I want to see the data often, but I'll have access to the logger only at the end of the month-long experiment.

Nick
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treitmey



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PostPosted: Fri Aug 24, 2007 7:53 am     Reply with quote

I would use a serial logger and a pair of radio modems.
http://www.maxstream.net/products/xstream/rf-modem-rs232.php
mmprestine



Joined: 13 Jan 2004
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PostPosted: Sun Aug 26, 2007 7:16 pm     Reply with quote

These are great modules for your project.


http://www.sparkfun.com/commerce/product_info.php?products_id=155
kender



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PostPosted: Sun Aug 26, 2007 7:28 pm     Reply with quote

mmprestine wrote:
These are great modules for your project.
http://www.sparkfun.com/commerce/product_info.php?products_id=155

Thanks! Unfotunately they are way too large.
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mickent



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PostPosted: Mon Aug 27, 2007 6:48 am     Reply with quote

Hello Kender, These zigbee modules are about the size of a 9v batt but operate at 2.4 GHZ. They have a built in A/D converter that you can setup with a internal clock.

http://www.maxstream.net/products/xbee/xbee-pro-oem-rf-module-zigbee.php

They are available in two power levels.
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