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  1. #16
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by croozeus View Post
    Hi Cassioli,

    Yes, IRDA is an an available alternative, so is Bluetooth.
    But, I would rather use the data cable rather than the IRDA to interface with the PC. Naturally the connection would be faster as I am using a wired media rather than a guided media,
    Moreover, I have seen many such interfacing projects built by students, generally using Visual Basic as it may be easy on that platform.

    May be you could try on that, if you have skills in VB.

    Best Regards,
    Croozeus
    I don't need high bandwidth, I just need to send a few bits! "turn on this", "turn off that",...
    And I have no difficulties in writing SW; the big issue is how to build the hardware to connect the phone to the devices to be controlled!

  2. #17
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by cassioli View Post
    I don't need high bandwidth, I just need to send a few bits! "turn on this", "turn off that",...
    And I have no difficulties in writing SW; the big issue is how to build the hardware to connect the phone to the devices to be controlled!
    Hi,

    If Speed and BW are not in the criteria, surely IRDA connection would work fine as well.
    Regarding the Hardware interfacing is concerned, I found this link, check it out if it helps.
    http://www.embedtronics.com/nokia/fbus.html

    Best Regards,
    Croozeus
    Pankaj Nathani
    www.croozeus.com

  3. #18
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by croozeus View Post
    Hi,

    If Speed and BW are not in the criteria, surely IRDA connection would work fine as well.
    Regarding the Hardware interfacing is concerned, I found this link, check it out if it helps.
    http://www.embedtronics.com/nokia/fbus.html

    Best Regards,
    Croozeus
    thanks, I already knew it and I already sent an email to the author (just a couple of days ago).
    His project looks too complex and too expansive to me, so I asked for a simpler solution.

  4. #19
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by cassioli View Post
    thanks, I already knew it and I already sent an email to the author (just a couple of days ago).
    His project looks too complex and too expansive to me, so I asked for a simpler solution.
    Oh good,

    Please do post the simple solution you get from the author, so that it can benifit others too!

    Best Regards
    Croozeus
    Pankaj Nathani
    www.croozeus.com

  5. #20
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by croozeus View Post
    Oh good,

    Please do post the simple solution you get from the author, so that it can benifit others too!

    Best Regards
    Croozeus
    I said "I asked", I didn't say "he sent me"!!

    Still waiting for any reply...

  6. #21
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    Exclamation Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by cassioli View Post
    I said "I asked", I didn't say "he sent me"!!

    Still waiting for any reply...
    How can this be achieved using IR??

    Any circuit diagram will help.

  7. #22
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    Re: Interfacing a microcontroller to a cell phone

    I (possibly) found a better and cheaper and easier way to connect any phone to a PIC.
    It's just an idea, I'm currently studying its feasibility.

    Almost any phone has an headset port: this port "emits" an audio signal, i.e. a variable voltage.
    I can easily drive this voltage by making the phone playing a midi tone (it's just a matter of adding a couple of lines to a standard "HelloWorld" midlet).
    So I can decide when and how long to emit sound from audio port.

    Some PICs have an Analog/Digital converter pin.

    So, adding a simple RC filer to the audio output, just to obtain a constant voltage rather than a 440 Hz sinusoid ("A" note), should be enough to enable PIC to detect and process signals from the phone.

  8. #23
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    Re: Interfacing a microcontroller to a cell phone

    Some starting points for my projects:
    Using AD converter on PIC

    Morse code decoding (useful for timing)

    AD conversion in Proton BASIC


    Proton BASIC
    (free for <50 lines programs)


    Any help would be appreciated.

  9. #24
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    Re: Interfacing a microcontroller to a cell phone

    Further resources:

    Example source (working?)

    Wide explanation

  10. #25
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    Re: Interfacing a microcontroller to a cell phone

    Once figured out if my idea is feasible... here it is what we could use it for!

    http://www.jrkerr.com/boards.html

    The cheapest (33$):
    http://microcontrollershop.com/produ...oducts_id=1193

    edit:
    Further ideas for the project (once it is working):
    we could drive the cellphone connected to the pic, by writing a program on another phone, which, once we change settings as we like, updates a web page by means of http request (which requires very low data amount to be sent over GPRS), and then starts a call to the remote phone: upon receiving the call, the phone reads those data and acts accordingly.
    That should be much cheaper than using SMS to communicate with the phone.

    Updating a web page is very easy:
    http://www.mobilenin.com/pys60/info_networking.htm

    It's a python source, but method is easily portable to any platform.

    Main problem is how to get remote phone connected to network without asking for user permission! This can be overridden simulating keypress with python, but it's not possible on a java-only phone.

    So, what about "push methods" to send data to mobile devices? How does it work?
    Last edited by cassioli; 2008-09-30 at 14:44.

  11. #26
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    Re: Interfacing a microcontroller to a cell phone

    I did it!

    Manual activation:
    http://it.youtube.com/watch?v=jabwFK9zV_I

    SMS activation:
    http://it.youtube.com/watch?v=DZwjyWNc7ds

    Needed HW:
    - a PIC with analog comparator (I used 16f628a)
    - nothing else!

    Just connect your headset to the comparator input, and write a proper SW for the PIC which writes "1" on a pin upon detecting "1" on C1OUT (Output of comparator).

    I'll not give out more details, as I think such a simple&cheap circuit could be used for dangerous projects too , so if you want do build it, it's up to you.
    I just discovered it's possible and that's all. Sorry.

  12. #27
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by cassioli View Post
    I said "I asked", I didn't say "he sent me"!!

    Still waiting for any reply...
    HI italian guy..i just wonder about your proyect. and i like to know if there is a way to do with irda. and you can help with this. with the mcp 2150 of microchip. any light about that will be apreciate..

  13. #28
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    Re: Interfacing a microcontroller to a cell phone

    Quote Originally Posted by RioThamus View Post
    HI italian guy..i just wonder about your proyect. and i like to know if there is a way to do with irda. and you can help with this. with the mcp 2150 of microchip. any light about that will be apreciate..
    you should implement IrDA on a PIC: it should be possibile, maybe it has already been done, but it would require a lot of hardware parts.

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