Read & Send SMS from a Mobile using PIC Microcontroller

[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]

Chakkarapani, you are not saying much about your hardware. I hope you have used a max3232 to connect the Fbus to the PC otherwise you have burned the Rx line. (Fbus is 3.3 Volts)

http://www.datasheetcatalog.org/data...ts/max3232.pdf

Most of the AT command (not all) works also with Fbus.

Alberto

[abbas.khodaeian]

Hi friends,
I'm in the same way to perform this project with PIC and Nokia 3310.
But i find out the PIC 16F84A only can support the 9600 bps Baudrate and less than it. But the nokia 3310 FBUS, only can support the 115200 bps baudrate.

which PIC micro have this buadrate, that i can connect it to nokia?

we know, to open the bus between the nokia and PIC, we must to send 'U' 128 times. and then the bus is opened to communicate data between them selfs.

any Idea for this? for the same baud rate of nokia 3310 in PIC?

thanks in advanced.

[sahin5002]

Chakkarapani, you are not saying much about your hardware. I hope you have used a max3232 to connect the Fbus to the PC otherwise you have burned the Rx line. (Fbus is 3.3 Volts)

Alberto

Hi aratti , Can you please give me a schematic for connecting SIM300CZ (www.sim.com) and pic 16F877A. mainly the Tx Rx line