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Phone Call Counter

Discussion in 'Electronic Basics' started by Ian R. Adlon, Feb 28, 2004.

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  1. Ian R. Adlon

    Ian R. Adlon Guest

    I am looking for a circuit that will count the number of incoming phone
    calls. It should use two 7-segment LED displays to display the number of
    calls that have come in.
  2. Bill Vajk

    Bill Vajk Guest

    You need to be a bit more clear with your request. Do
    you want to count the rings or the "off hook"
    episodes? Neither gives you a precise "incoming
    calls" count. Radio shack used to make a device
    which monitored the phone line that served to
    detect incoming calls (as an offhook after some
    [# reported} rings including duration) and as what
    is called a pen recorder which reports the outgoing
    call number and the duration of the call, all printed
    on a paper adding machine tape.

    They may have a newer version.

    There are some modems that collect Caller ID information
    and process that to a file but they don't report whether
    or not the call was answered.
  3. Jerry G.

    Jerry G. Guest

    This is very difficult to do from a cell phone. You would need a receiver
    that can ID your code set from the repeater. This would be like the front
    end of a cell phone. Then there would be the decoding which is proprietary
    to the phone company.

    Your phone company should be able to provide you with detailed billing. All
    the modern cell phones can display and remember up to at least 30 previous
    calls. You should be able to configure this to show the number of calls,
    dates, times in and out, and total times of each of the calls. Therefore
    there is no real need for what you want to do.

    Also, many phone companies offer a telephone traffic fax-back service. In
    our place we get a fax every for 30 calls from and to, for any of our phone
    lines and cell phones as well. At the end of the day, or a few times a day,
    we get a fax from the tele company of all the tele traffic, and details of
    each call. We get the number dialled, time and date of the call, duration of
    the call, and if it is a received call we get the number of the location
    that dialled us. This can be used as a legal record, and also to keep track
    of the telephone companies billing at the end of each month. We keep these
    records for 3 years.



    Jerry Greenberg GLG Technologies GLG

    I am looking for a circuit that will count the number of incoming phone
    calls. It should use two 7-segment LED displays to display the number of
    calls that have come in.
  4. Guest

    I know Elector used to have such a counter in their magazine, a long time
    ago. Maybe they stored it in their archives somewhere.
  5. Chaos Master

    Chaos Master Guest

    If by "incoming call" the poster means "when the phone rings", I think that one
    of those DTMF decoding IC's (e.g. HT9170 from Holtek) can be used. It has a
    microcontroller/microprocessor interface so you need just to detect when there
    is anything at the outputs (BCD-coded number IIRC).

    by Chaos Master® - MSN:

    "A Elbereth Gilthoniel, silivren penna miriel o menel aglar elenath!
    Na-chaered palan-diriel o galadhremmin ennorath,
    Fanuilos, le linnathon nef aear, si nef aearon!" - The Lord of the Rings

    Linux User #327480 / GNU-Win32 / Cygwin / Win98 + LiteStep
  6. Bill Vajk

    Bill Vajk Guest

    I don't see any "ring detect" in the chip you mention.

    But there is a unit that does fill the bill at
  7. I can't put my hands on the circuit now, but many years ago I made a
    gadget to do that. When I returned home, if there had been any
    incoming calls a (an?) LED would be flashing and a counter showed how
    many unanswered calls had been detected. The counter was actually a
    mechanical, solenoid-operated type - this was my surplus hoarding
    period. The detector was a small coil fitted underneath phone on
    suction pad. From memory, the circuit amplified the ac voltage induced
    into the coil, converted it to DC, then increased counter by 1 when
    ringing was followed by some relatively long period of silence.
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