Read & Send SMS from a Mobile using PIC Microcontroller

[Chakkarapani]

Hi, Please help me out if u find any solution. . .

I want to read an SMS i received in the mobile phone using the PIC microcontroller.
I found many article stating that using Fbus we can send and receive SMS with the help of AT commands. Also i found that Septet has to be converted in to octet.
My problem is how i will convert it and interpret it. Is it i have to manipulate with the program what i write? or anyother logic is behind that...
My ultimate aim in my project is to enhance mobility, so i am not using any PC here.
whatever the site i visited, it is providing interface through hyperterminal for using AT commands...
how can i use AT commands through microcontroller?
Please provide me some solutions...

[isaac]

Here are a few question to help you get the best from the forum

1. What Phone are you going to use
2. Text Mode or PDU

Remember not all phones support Text Mode but its mush easier to use than Pdu.

[Chakkarapani]

I am using Nokia mobile phone and PDU mode.

Please helpme out . . .
regards,Chakra.

[abicash]

Hi
You can check www.ucdevelopers.page.tl for a detailed understanding of the NOKIA FBUS for a newbie. It is written for interfacing to AT89S52 but can be easily ported to PIC
Check the excel sheet which can explain the few commands of FBUS reqd for SMS control.

[Chakkarapani]

Hi, Initially i made the circuit on a general purpose PCB for interfacing mobile and PC to have exercise on AT commands and to know how it works.then i connected my Nokia 3315 and PC-COm with this circuit,my hyperterminal is not responding to any of the AT Commands.
I am unable to find whether my mobile modem is responding or not.
I kept my hyper terminal settings as;
115200 baud
no parity
one stop bits
flow control is none
8 data bits

And i am not much clear about that setting of DTR and clearing of RTS;
how to do that?

I used the ckt which has been shown here;

http://www.forosdeelectronica.com/about2.html

is the ckt is right?

what changes i should make to get a response from hyperterminal for AT.

Please help me out...

[abicash]

Hi Chakra
Nokia 3315 doesnt support AT commands.Its made up with a special protocol called FBUS protocol.Its a bit difficult.But see my earlier post on this for the link where u can understand this.Get back if u have any problem.

[Chakkarapani]

Thankyou for your information abicash.
I am having a 3310 mobile also with me i tested with that mobile also i am not getting it.
I would like to know what is the exact voltage level on which the mobile phone is working?
Also I would like to know whether the ckt what i used will work fine or not?

One more thing i purchased that serial cable, you are saying that we have to set DTR and clear RTS to power up the cable, i am not getting it clearly. is that i should open the cable end to do so? And if it is so how can i do it?

I just purchased the cable and connected with the mobile phone, i am not getting any response from that!

Please help me out abicash...

[Chakkarapani]

Please confirm me can Nokia 3310 support AT Commands?

http://discussion.forum.nokia.com/fo...threadid=15433

In the above link they are saying Nokia 3310 doesn't support...

[muddy0409]

After wading thru piles of info on Nokia and AT commands, I found (can't remember exactly where) that you cannot simply do AT commands to tell a Nokia to send SMS messages. This resulted in my trrowing away my plans to use Nokia gear and moving over to Sony Ericsson, MUCH easier to work with considering their AT command set DIRECTLY controls their onboard modem directly.

[aratti]

sahin5002, I am posting a schematic where I have modified the pin out to fit your 16F877. Since you are using a 3 volts modem you must be very carefull to connect it to the pic. The modem Tx can be connected to the Rx (input) directly without any problem, while the modem Rx must be connected to the pic via a resistors partition so that the TTL (5 Volts) will be reduced of 1/3 prior to input it to the modem. The rest of the pin out has been made compatibile with my project SMS IO Controller, but you can change them as you like to suit your need.
If you want to give a look to my project you can find it @ http://techni.caliti.es/blog/2008/12...ontroller.html.

Al.