Keypad interface to Miicrocontroller

Discussion in 'Embedded Systems and Microcontrollers' started by Art, May 9, 2008.

  1. Art

    Thread Starter Distinguished Member

    Sep 10, 2007
    785
    61
    Hi Guys,
    Id like to interface a microcontroller directly to the keypad of a mobile phone.
    The mobile phone is dedicated to the project, and is disassembled so that the
    keypad contacts can be directly soldered to.

    Since the phone has a matrix keypad, I can't just use simple transistor switches to
    complete the button connections, as the transistors won't share a common ground.

    I'm looking for ideas on how do do this without using the Nokia FBUS/MBUS protocol.
    Cheers, Art.
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    You could use bilateral analog switches to connect the matrix points.
     
  3. Art

    Thread Starter Distinguished Member

    Sep 10, 2007
    785
    61
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