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replacing data cable for mobile


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ENG\ AHMED

Fri May 09 2008, 02:06AM

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hiii all,
i need to make interfacing bet. mobilephone (nokia 6100) and MCU ,so i try 1st to connect the mobile with hybridterminal but it not work at all and not work also with nokia pc suit,but it work with logomanger,Is the data cable is responsable for that?
if yes haw can i modefay thise cable or make a new one?

Eng_Z

Sat May 10 2008, 09:55AM

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Hi Ahmed,
I have the same problem with my project and I need help too
the phone is nokia 6100 and I have tried many commercial cables (serial ones) with many programs but only logomanager and oxygin did work
I need the phone and the cable to work with hyberterminal to be able to send AT-commands from the hyper to the phone, so I tried to make a homemade one but till now it does not work it is still under test
the circuit and the explanation in the following link;

http://www.panuworld.net/nuukiaworld/hardware/cables/fbus.htm

But I hope if any one has any experience with that please help

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Eng_Z

Sat May 10 2008, 10:22AM

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hi Ajay
Do you have any experience with that ?
and if you have (I hope you have) Does the above circuit work with AT-commands?

Waiting your reply,,

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Ajay

Sun May 11 2008, 04:26PM

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you can directly connect your controller RX and TX with phone as both are going to be on TTL levels. so only three pins of 6100's port tx, rx, and GND.

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Eng_Z

Sun May 11 2008, 10:45PM

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hi Ajay,
Thank you for your reply, I will try that soon and I will tell you the results
but what if we make a voltage divider at the RX of the phone to convert the 5v of the micro(Atmel8515)to 3v that because I knew that the phone (6100) voltage level is 3v
does the 5v harm the phone?

thank you

[ Edited Sun May 11 2008, 10:47PM ]

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Ajay

Mon May 12 2008, 03:14PM

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well just limit the current using resistor and surely a voltage divider is needed. phone is more important

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say2paul

Wed Jun 25 2008, 04:23AM

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Ajay wrote ...

well just limit the current using resistor and surely a voltage divider is needed. phone is more important

Does limiting the current with a resistor means the voltage divider or voltage divider is something else?

[ Edited Wed Jun 25 2008, 04:23AM ]

Ajay

Thu Jun 26 2008, 01:56AM

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it means voltage drop...

voltage divider is when you divide voltage using two resistors..

| V1 | V2 |
|/\/\/\|/\/\/\|
R1 R2

V1 = R1 * (Vtotal/R1+R2)
V2 = R2 * (Vtotal/R1+R2)

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