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Wireless Comm. with a Cell Phone and a Propeller — Parallax Forums

Wireless Comm. with a Cell Phone and a Propeller

PhilldapillPhilldapill Posts: 1,283
edited 2009-02-23 08:58 in Propeller 1
Just curious if anyone has ever worked on making a sort of modem for a cell phone? What I had in mind, is a sort of universal modem that "talks" and "listens" through the speaker and microphone of a cell phone. The application would be LOOOOOONG range remote control. It wouldn't need to be super high speed - just something that can relay certain commands here and there, like "fly to this GPS waypoint and hover at X feet"

Comments

  • Mike HuseltonMike Huselton Posts: 746
    edited 2009-02-20 17:23
    Are you speaking of bi-directional acoustic interface? I am confused by your lack of information and generalities.

    I hope I'm not being cranky - just confused.

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    JMH
  • LeonLeon Posts: 7,620
    edited 2009-02-20 19:39
    A GSM modem should do what you want.

    Leon

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    Amateur radio callsign: G1HSM
    Suzuki SV1000S motorcycle
  • JCeeJCee Posts: 36
    edited 2009-02-20 19:53
    There was a thread about sending txt messages via pre-paid cell phones.· Not exactly a modem but it may work for sending commands over a "Loooooong" distance.

    ·http://forums.parallax.com/showthread.php?p=757219
  • PhilldapillPhilldapill Posts: 1,283
    edited 2009-02-20 19:56
    Excuse my generalities. I've thought of the text message approach, and this may be good for sending "reports", however, I think there may be too much delay in the time it takes to send the SMS, and receive it. I've noticed that when I text a friend in class, he sometimes gets the message 2-3 minutes later.

    What is a GSM modem? How much are they? I assume it's a modem that interfaces with a cell phone, rather than a land-line?
  • J. A. StreichJ. A. Streich Posts: 158
    edited 2009-02-20 20:18
    Let me google that for you.

    Sorry I couldn't resist. [noparse]:([/noparse] Bad me.
  • sylvie369sylvie369 Posts: 1,622
    edited 2009-02-20 22:15
    If there's one dramatic change in the modern world, it's that one: I never think of a question without immediately thinking "I'll Google that and find out".
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2009-02-20 22:49
    Here's a question: Which would cost the subscriber less, sending a 100-character text message or sending the same text via a 1200 baud modem as a regular (2- or 3-second) phone call?

    -Phil
  • rjo_rjo_ Posts: 1,825
    edited 2009-02-20 23:15
    Phil

    well... I have unlimited phone calls... but limited text... So in my case... it would be the phone call.

    So, if you are building a general purpose modem... to use the voice mode to send data info... I think you have a winner... a cross-platform, intergalactic, WWF winner[noparse]:)[/noparse]

    The other thing I would like in my breadbox is the ability to clone my own simm card... the crooks can do it, but I can't.

    I am currently leaving one of my simm cards in my Telit module and most of the time, I'm not using it... so, it is a cost without a benefit... except for the fun that I am having of course[noparse]:)[/noparse]

    ILMP

    Rich
  • PhilldapillPhilldapill Posts: 1,283
    edited 2009-02-21 00:40
    Phil, also, what about speed? If you are controling something continuously and you need near-instant control for long durations, I don't think a text message would work. I'm assuming it's because the overhead involved in establishing a connection each time, while on the other hand, a ongoing phone call is pretty instantaneous(MAYBE a 1 second delay if even that.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2009-02-21 01:39
    I doubt there's more than a few ms delay. Otherwise cellphone conversations would be very tedious!

    -Phil
  • PhilldapillPhilldapill Posts: 1,283
    edited 2009-02-21 02:06
    Exactly my point! I have, however, experienced some sort of weird delay/echo before, but only once or twice.
  • rjo_rjo_ Posts: 1,825
    edited 2009-02-23 04:00
    Is it just me or has cell phone quality taken a dip lately... is there a variable delay being put into the start of a conversation and random bits being dropped... to defeat efforts just like this one?
  • Mike HuseltonMike Huselton Posts: 746
    edited 2009-02-23 08:58
    I would use DTMF in voice-only mode, using the audio jack provided. DTMF is designed for noisy phone connections. Albeit slow, but accurate.
    DTMF should be capable of being generated using 2-4 resistors and a capacitor. Did I mention DTMF is bi-directional?

    That is why I immediately had a vision of an acoustic modem - being a thirty year electronics engineer and a professional audio guy.

    Links:

    Basic Stamp DTMF generator circuit - bobblick.com/techref/projects/tonedec/tonedec.html
    Send and receive -
    Arrow Electronics
    (Top of page)
    Manufacturer Part # Manufacturer Name Description RoHS Lead Time Available Price Buy
    W91330ALN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
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    W91330N Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 18-Pin PDIP EU - Not Compliant
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    W91510AN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91320AN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
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    W91350AN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
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    W91531ALN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
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    W91320LN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91530AN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
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    1-800-833-3557
    W91530N Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 18-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91320ALN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 22-Pin PDIP EU - Not Compliant
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    W91344AN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91350N Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 18-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91560N Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 18-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91472N Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 18-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    W91360AN Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP EU - Not Compliant
    China - Not Compliant Call For Quote.
    1-800-833-3557
    PCD3312CT NXP Semiconductors DTMF TRX 3.579MHz CMOS 3.3V/5V 8-Pin SO EU - Compliant
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    PCD3311CT NXP Semiconductors DTMF TRX 3.579MHz CMOS 3.3V/5V 16-Pin SO EU - Compliant
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    W91540N Winbond DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 18-Pin PDIP EU - Not Compliant
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    75T204-IL TDK 5V LOW-POWER SUBSCRIBER DTMF RECEIVER EU - Supplier Unconfirmed
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    Jameco Electronics
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    Part # Description Jameco # Stock Price
    TCM5089N DTMF TOUCHTONE GENERATOR DIP16 Catalog 32803 Buy 521 1-9: 5.75, 10-49: 5.25, 50-: 4.75

    Query finished in 0 seconds
    JDR Microdevices
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    JDR # Description Stock Price
    MC145436P DTMF decoder 14P DIP Yes $2.99

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    Part # Mfg. Part # Description In Stock Link Unit Price
    336-1283-ND DTMFDECODER-RD KIT REF DESIGN DTMF DECODER Yes Buy 1: 149.00

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    JMH

    Post Edited (James Michael Huselton) : 2/23/2009 9:47:07 AM GMT
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