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Schematic pls — Parallax Forums

Schematic pls

robertoroberto Posts: 37
edited 2006-03-30 05:39 in BASIC Stamp
Where could i get a reliable schematic a for basic stamp 2 to interact with a 4x4 keypad.



thanks in advance

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-29 19:31
    The following thread went into great detail on many ways to do this and possibly some schematics.

    http://forums.parallax.com/showthread.php?p=570329

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    Parallax Tech Support
    csavage@parallax.com
  • robertoroberto Posts: 37
    edited 2006-03-29 20:22
    i am new to this stuff i dont wanna get into one 1 pin i/o just yet
    could someone direct me to a basic 4x4keypad
    scematic using basic stamp2

    thank you
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-29 20:26
    I did, with the link above.· All the initial responses to that thread were regarding parallel I/O of the keypad.· Did you even read any of the messages at the link?

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-03-29 20:40
    · This is a link to a datasheet for a 20-key decoder.· Don't panic -- you don't have to use all 20.· It outputs a 5-digit binary number for each key/button (it's based upon a matrix / row-column affair) along with an output that goes HI when any key is pressed (Data Available.)· The output states·latch each time.

    http://jameco.com/wcsstore/Jameco/Products/ProdDS/44572.pdf
  • robertoroberto Posts: 37
    edited 2006-03-30 00:48
    was wondering if it was possible in someway to log the real time on each keytroke
    is that possible if yes using what ? does it require hardware or programming ?

    555 chip is that for it?
  • SSteveSSteve Posts: 808
    edited 2006-03-30 05:39
    I don't think the 555 would be best for that. It's just a timer, not a real-time chip. I'd look at something like the DS1302 or DS1307.

    www.parallax.com/detail.asp?product_id=604-00005

    www.maxim-ic.com/quick_view2.cfm/qv_pk/2688

    There are code examples for interfacing with the DS1307 in the StampWorks manual (downloadable from Parallax' web site).

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