4*3 Keypad help

Discussion in 'The Projects Forum' started by kevin306, Apr 18, 2013.

  1. kevin306

    Thread Starter New Member

    Apr 18, 2013
    7
    0
  2. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,675
    2,722
  3. kevin306

    Thread Starter New Member

    Apr 18, 2013
    7
    0
    Yes my lecturer was saying that but I didn't fully understand what I am meant to do. what exactly do I do?
     
  4. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,675
    2,722
    I'm assuming you're trying to figure which pins relate to which rows and columns with respect to the keyboard, yes?

    Well, think about what a key (switch) does in relation to those rows and columns. Then use an ohmmeter to identify which key is represented by which row and which column.
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,421
    3,357
    It is shown on page 6 of the datasheet.
    For a 4x4 keypad there are 8 pins, 4 rows x 4 columns.
    For a 4x3 keypad there are 7 pins, 3 columns x 4 rows as shown on the datasheet.
     
  6. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,675
    2,722
    Ha...I didn't even realize he posted one. You shouldn't have told him...he would have learned more the hard way.
     
  7. paulktreg

    Distinguished Member

    Jun 2, 2008
    611
    120
    The information is on the datasheet page 6.

    X1 connects to 1,4,7 & *, etc.

    Y1 connects to 1,2 & 3, etc.

    Still not sure?
     
  8. kevin306

    Thread Starter New Member

    Apr 18, 2013
    7
    0
    Never even saw that to be honest. Thanks for that cheers.
     
  9. WBahn

    Moderator

    Mar 31, 2012
    17,716
    4,788
    But do you know whether you have a matrix or a common point keypad? Count the number of pins and compare to the data sheet.
     
  10. kevin306

    Thread Starter New Member

    Apr 18, 2013
    7
    0
    Though I had it wired up correctly but looks like I dont. The way I connected it was the row 1,2 & 3 are X1,X2 & X3 respectively. And the columns are Y1,Y2,Y3 & Y4.
     
  11. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,675
    2,722
    Have you tried an ohmmeter yet?
     
Loading...