problems interfacing Uc atmel8535 with sony ericsson T230

sony ericsson t23 technical

we are trying to build a project in which we interface an atmel8535 with a sony ericsson T230 by sending AT commands,
we has a successful communication while testing the commands with the hyperterminal and phone,
also our microcontroller supported serial communication with the pc.
however, the Uc and the phone are not being able to establish communication through the C programs we are trying to develop using codevision c compiler.

we have made a testing cable that connects the Uc and mobile, wherein the RTX and TXD connected, ground too, and have shorted the RTS and CTS (is this required?)
it doesnt work this ways...
do we need to give in sum additional voltage for any connections?

also if one guide us in the format of sending the AT commands through the C program... we're really stuck at this stage... would really appreciate sum giudance. thanx...

t230 interface signals

you have working case with PC to phone . Sniff the cable and signals there then try to figure out what is missed on uc side.

good luck

sony ericsson t23

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Re: problems interfacing Uc atmel8535 with sony ericsson T23

we're newbies at this, so it would be really helpful if you could elaborate more on it.

Re: problems interfacing Uc atmel8535 with sony ericsson T23

Hi!
First of all since ur mobile was working with the PC it means that maybe something is wrong with the code that you have written for the microcontroller.

1. Remeber one thing that the PC sends the data to the phone through a cable which converts the +-12 signals of the PC to 0-3.3volts signals of the phone.
If you are using the same cable directly with the microcontroller then it will never work.

2. In order to communicate with the phone you will have to use MAX232 with the mirocontroller.

so kindly check these things first.

3. If you have already considered the first two issues, then check the software of the mcirocontroller that is communicating with the phone. This can be done by simply sending the commands from the microcontroller to the PC.

Regards.

Re: problems interfacing Uc atmel8535 with sony ericsson T23

tanyajajodia wrote:

we're newbies at this, so it would be really helpful if you could elaborate more on it.

Click to expand...

Information inside this post
**broken link removed**
completely describe how to interface Cell phone to µC, also describe how to send AT command to Cell phone thru µC Serial port.
Start from that point, first chose your cell phone and µC, then design your own system.

AT command for all cell phone, is following the standard describe on ETS (European Telecommunication Standard) document number 300 585 :
Use of Data Terminal Equipment - Data Circuit terminating Equipment (DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)
(ETSI GSM 07.05)
So SMS handling for all cell phone use the same method, attached file is a good SMS handling Tutorial from Telit Communications SpA Italy.

Study that tutorial, after that we'll discuss more detail.

Re: problems interfacing Uc atmel8535 with sony ericsson T23

hey thanx a lot budhy,
as per your pin diagram, we rectified our 9-pin connections and voltages..

our microcontroller and phone are now interfaced fine.. the phone is accepting the AT commands written in C....

hi, i'm starting a project too, trying to connect silbas f020 to a sony ericsson t226/237. I'm having problems with the comunication: i'm sending "AT" to the cell phone + "0x0d" (for CR), and waiting a response, but nothing happens. I connected it cutting a data cable (serial to usb, kept the serial side) and conecting only RX, Tx and GND to the MCU, and shorting RTS and CTS. Any ideas that tell me why it doesn't work, i'll be gratefull.

Re: problems interfacing Uc atmel8535 with sony ericsson T23

spazos said:

hi, i'm starting a project too, trying to connect silbas f020 to a sony ericsson t226/237. I'm having problems with the comunication: i'm sending "AT" to the cell phone + "0x0d" (for CR), and waiting a response, but nothing happens. I connected it cutting a data cable (serial to usb, kept the serial side) and conecting only RX, Tx and GND to the MCU, and shorting RTS and CTS. Any ideas that tell me why it doesn't work, i'll be gratefull.

Click to expand...

I use this circuit to connect pic and Sony Eric.. T290 and work fine. About cable I bought a DCU-11 model and I've removed the usb to serial converter only used the phone's connector.

Interfacing ATmega16 with sonyEricsson t290

Can Anyone will please help me out for interfacing Atmega16 with SonyEricsson T290 and if you will explain the circuit diagram for it than it will b highly appreciated.
Kindly do Reply