sms

stef

Hi everyone.

I have a project coming up and I need so resolve the following problem.

Can a propeller that is connected to a GSM (still to find correct model) when a sms is recieved decode the message and swicht the correct relay. I like to send very simple sms messages with a number in it to activate relays.(perhaps not only a number but a pssword and a number)

Any help is welcom.

Stef.

pgbpsu

I can't answer your question, but I know that Jay had started working on this problem. Have a look at this thread:


http://forums.parallax.com/showthread.php?t=107112

stef

Hi

Thanks for the reaktion. I read the treath but it is only for sending sms. I 'm interested in the recieving sms and reaktion on the recieved message.

Has anybody knoladge of that? Some examples from where I could stard would be nice.

Stef

Leon

There shouldn't be a problem. Just receive the message and parse it.

StefanL38

the propeller is thumb like a pc is completely thumb without an operation system.

As you now from your daily experience with PCs you can do a lo of you have the right software.

It is the same with the propeller.

In the object-exchange there are several drivers for receiving serial data.
Even with very high baudrates (up to 115200 baud)

Most of this drives expect the serial data in zhe "8N1"-format
which means 8 databits no parity 1 stopbit.

For short messages with 5 or 10 characters (5 to 10 bytes) almost any of the drivers can be used.
If you want to receive up to 500 bytes within a very short time at high baudrates you would have to use a driver where you can set the buffersize to such a big value.

So as you still haven't decided which GSM-phone take one that has a
standard RS232 serial interface and that uses 8N1 as the manufacturers pre-settings to communicate. Baudrate can be adjusted to almost any value between 300 and 115200.

I guess there are not so many mobilphones that still have a serial interface.
The once that have one I guess most of them will communicate at 9600 or 19200 baud 8N1. Anyway I recommend to study the usermanual to be sure that it REALLY has a RS232 interface (with an USB-interface you are forced to find out the mostly propriarity dataprotocol)

It will be not as easy as to set the propeller into a receiving mode and the phone will send the sms-characters automatically.

To realise the communication you have to refer to the usermanual what serial commands are used to control the phone over the serial interface.

Sending these commands is a piece of cake for the propeller - but - you have to code the right bytesequences.

best regards

Stefan

stef

Hi

I found in my closset the following modem: GSM-T55I. It has a serial interface and I'm going to play a bit with the settings.

Thanks again for the help in this posts. I will try to find a way to recieve the text message over the serial connection.

Stef

max72

Check also the regexp object.
It could help string parsing.

Massimo

electrosys

Here is the same project as yours (control up to 8 relay by SMS) with another microcontroller (AVR), but there are some good stuff about decoding the SMS messages and perhaps an example to look after.

Jay Kickliter

Thanks for posting that link. I lost my original code, and forgot that I had posted it. I thought it was gone forever.

pgbpsu wrote: »

I can't answer your question, but I know that Jay had started working on this problem. Have a look at this thread:


http://forums.parallax.com/showthread.php?t=107112

stef

Hi max72

I can't find the object you mention in your post. Can you point me a bit further?


Thanks electrosys. This helps a lot.

Stef

max72

stef wrote: »

Hi max72
I can't find the object you mention in your post. Can you point me a bit further?

Here we are..

http://forums.parallax.com/showthread.php?t=117496

Massimo

stef

Thanks max72

stef