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Thread: dtmf based control help its really urgent

  1. #11
    Senior Member Cyborg sudarshan's Avatar
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    Virudhunagar - 626001, Tamilnadu, India
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    Quote Originally Posted by Ulhas View Post
    True only if you don't have any other inputs or pull up connected to PORT A ie your upper Nibble must be at logic 0
    other wise AND it with nibble then only you can switch PINA data
    i really could not uderstand the above.
    i use PORTA0-3 for input and
    PORTA6-7 as output .

    so can i use switch PINA
    BY
    Sudarshan Anbazhagan,
    SuperBotics MultiTech Pvt. Ltd.

    http://www.superbotics.com
    http://www.getahost.in

  2. #12

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    HI , I think convertingt the binary value to hex is very straigt forward. The circuit should be using CMM8870 or an equivalent IC with 3.578 MHz crystal (thats the standard) now the hex values are as follwows
    1) 0x01
    2) 0x02
    3) 0x03
    4) 0x04
    5) 0x05
    6) 0x06
    7) 0x07
    8) 0x08
    9) 0x09
    0) 0x0A
    .) 0x0B
    #) 0x0C
    A) 0x0D
    B) 0x0E
    C) 0x0F
    D) 0x00


    This is as simple as a,b,c dear.......


    Asimov

  3. #13
    Senior Member Cyborg sudarshan's Avatar
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    my problem with values are cleared .
    but the new problem is with reading the value
    for switch case
    switch(PINA)
    {
    case ...:
    }
    can i use the above or not
    i use PORTA0-3 for input and
    PORTA6-7 as output ...
    BY
    Sudarshan Anbazhagan,
    SuperBotics MultiTech Pvt. Ltd.

    http://www.superbotics.com
    http://www.getahost.in

  4. #14

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    Sudarshan, i know you are trying really hard to make this circuit, but i would advise you to study a little bit of theory first.What does a nibble mean ? What is a pull up ?. Ulhas could have been a little lucid in the presentation , but he told you the way. Only if you could understand the relevant terms in the above lines, you could decipher it.

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