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Topic: Personal Emergency Transmitter (Read 4 times) previous topic - next topic

Bainesbunch

Interestingly I am not having such headaches with the system I am designing for a client that control access to vehicles over the GSM network using SMS based calls and commands. The same board also has accelerometers and an extended SPI interface to chatter with other modules in the collection. My client is using a simple GSM shield that I have placed onto a custom PCB along with a ATMerga328 and supporting bits and bobs ( i cannot be too specific as it would violate my NDA )

Cheers Pete.



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I'm not aware of how to send an SMS from a regular land line, but that'd be worth looking into.


Hi Jack, I already contacted the OP before and had a very detailed talk on the quote I made to him , but he was looking for something way cheaper , The thing here everybody needs to understand who has not experienced sending sms or calls using the telephony system is that the cost of hardware is costly and is complex in making the system dependable , i have worked a lot with independent telephony cellular modules like SIM 300 etc and SMB5100 etc among other and have noted that the programming to have dependable real time systems with these is really tricky and involves considerable headache and hardwork so this project is going to be somewhat costly.


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NI$HANT

@ Baines bunch , as I have already specifiedIit also depends over the carrier you choose some accept the development like some Sims are locked and some are open on all ports, also in Europe companies are more supportive with all this stuff developers do with their Sims in Asia if you call the customer care to unlock the ports on sim then they would never know what not are talking about and as such tech support is too weak also implementing sms is easy as to implementing GPRS .this is what I have experienced and worked out at another part of the world!
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Bainesbunch

@ NI$HANT, Sorry but I have just gone through all the post by you in this thread and I can't seem to find the bit where you talk about carriers (apart from your reply to me), you do talk about bands, perhaps we have a misunderstanding of terms here.

You are right that SMS is an easy option but then not everywhere has GPRS and so in order to have a system that falls back to the lowest common denominator SMS over GSM is the obvious choice.

Why over complicate a system ?

"KISS" is the name of the game in cost effective development where future extensibility is not a show stopper.

I have no desire to get into a debate over this, i was just stating that I have not experienced the difficulties that you cite when explaining the complexities and subsequent cost of mobile communications development using either GPRS or GSM .

Perhaps i can help you to solve some of the issues you are having.


Cheers Pete.
EmbeddedAT .. From Concept to Prototype to Production

Electronics and firmware design and project mentoring

Andy R

Is there free GSM for emergencies or would GSM require a cell phone contract?

Here is a watch that could be programmed for this purpose: http://www.kickstarter.com/projects/597507018/pebble-e-paper-watch-for-iphone-and-android. It requires a smartphone.

boelle

not complete arduino but this might be of some use: http://store.open-electronics.org/Remote-control/GSM%20Remote%20Control/GSM%20Remote%20Control%20%E2%80%93%202%20IN%20and%202%20OUT

that one has 2 inputs and 2 outputs... one of the inputs can be used with this welleman kit: http://www.velleman.eu/products/view/?country=be&lang=en&id=352724

and this is the RF transmitter http://www.velleman.eu/products/view/?id=352760

dont know if the pricetag is ok, but the purpose is very well suited... with the outputs you can then remotely open a door if emergency people are there before you etc...

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