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cordless phone hack

Discussion in 'Electronic Basics' started by Jeff Zimmerman, Dec 5, 2003.

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  1. I am working on a robotics project, and i need a way to control it
    cheaply. I have a couple of cordless phones that aren't doing
    anything, so it seems simple enough to use the DTMF to drive some
    relays and operate the motors.

    If anyone could help me out, I would greatly appreciate it.
  2. Peter

    Peter Guest

    Sounds VERY interesting
  3. On 5 Dec 2003 08:16:52 -0800, (Jeff Zimmerman) wrote:

    Hi, just starting to learn about telephony in data comm class but will
    pass on anything i learn in the next 10 weeks that might be helpful
    here for you
  4. What do you need help with, specifically?
  5. I'm not sure how to even begin, I was thinking I could use a DTMF
    decoder (similar to one that will display the number dialed) on the
    line input on the base. but I think the voltages would be a problem,
    my robot is limited to 24 VDC.

    Another idea was to try to figure out where the tone is generated on
    the base and go from there. I think this would be alot harder.
  6. Anand Dhuru

    Anand Dhuru Guest


    Go to and scroll down the tutorials list to the
    DTMF decoder. I thinks that is pretty much what you are looking for.


    Anand Dhuru
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