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Telemetry, where to start?

My discussion with cell phone people (years ago) led me to believe that security was at issue.

I beleive Marc, in that the US cell phone companies are interested in charging more for data services.

The units sold at sparkfun.com web site state:

"You will need to provide a SIM card. Pull the SIM card from your phone, insert it into the module, and viola, you are making calls under your cellular account. Works with all providers currently supporting SIM cards (AT&T, T-Mobile, and Cingular)."

So, the bottom line here is that no-one in the US sells cheap off-the-shelf cell phones with a simple serial interface ( like everywhere else in the world).

Donald

PS: the cars have a modules like the GM862 Cellular Module.

Reply to
Donald
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In article , Leon writes

Unfortunately as the US entered the market late they developed their own standard so the "European" (global) system did not walk straight in to the US. It was a form of protectionism.

In the early days you could use your sim in the US but had to change phones. Now most phones are tri or quad band however not all services are availible.

Ironically the when the US "liberated" Iraq they decided to bring the Iraqi mobile phone system up to date by installing the US system. That had to be canned when the Iraqi's realised it was incompatible with the GSM system used by everyone else in the middle east :-)

There are also some advantages, in the current security situation, why the GSM system is preferable. It is also probably the same reason why the data services in the US are not the same as Europe.

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\/\/\/\/\ Chris Hills  Staffs  England     /\/\/\/\/
/\/\/ chris@phaedsys.org      www.phaedsys.org \/\/\
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Reply to
Chris Hills

There is a security issue. The problem is the US is paranoid. Though to be fair most of the world is out to get them these days,

Looks like a market opportunity. OTOH it is possible that there is "request" from the US government not to make those services easily available.

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\/\/\/\/\ Chris Hills  Staffs  England     /\/\/\/\/
/\/\/ chris@phaedsys.org      www.phaedsys.org \/\/\
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Reply to
Chris Hills

Q1: Do you need bidirectional dataflow? Q2: Is the data block small? (~150 bytes)

If so, then think about the nodes dialing a paging service and sending their packet.

Fishermen on the Columbia River used to broadcast weather & fish conditions this way. Stations would send pages to a central point which would then consolidate data and send pages to the subscribing members' pagers.

Reply to
David K. Bryant

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