Shop OBEX P1 Docs P2 Docs Learn Events
Parallax Digital I/O board schematic & Prop code. Do they exist? — Parallax Forums

Parallax Digital I/O board schematic & Prop code. Do they exist?

MicksterMickster Posts: 2,694
edited 2013-09-12 10:58 in General Discussion
There is mention of a board schematic but I am unable to find it.


Edit: Ah, just found mention of "595 object" for this.


Regards,


Mickster

Comments

  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2013-09-11 08:26
    "595" object? I suspect you are not looking for a board at all, but a 74594 shift register. This chip has been used since the early days of Parallax to increase i/o.

    http://www.nxp.com/documents/data_sheet/74HC_HCT595.pdf
  • MicksterMickster Posts: 2,694
    edited 2013-09-11 08:35
    I note that Parallax don't have a schematic download for the I/O board as they do with other products and the only sample code they provide is for the Stamp. It was only after I posted that the "Similar Treads" list has someone asking about Spin code for this board and he was pointed to the "595" object.

    Cheers!

    Mickster
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2013-09-11 09:17
    I will have the web page issues corrected in a little while. Making notes of some missing information from the switch to the new website and will get them all updated at once. Thanks for letting us know.
  • PublisonPublison Posts: 12,366
    edited 2013-09-11 09:23
    Loopy Byteloose wrote: »
    "595" object? I suspect you are not looking for a board at all, but a 74594 shift register. This chip has been used since the early days of Parallax to increase i/o.

    http://www.nxp.com/documents/data_sheet/74HC_HCT595.pdf

    Loopy,

    The 74595 is the shift register on this board, the "595" object works loverly with the board.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2013-09-12 08:42
    Apologies, I have not been keeping up with all the new boards that Parallax has produced.. There is a Digital i/o Board. Still, it seems the 74595 chip is what is attached to the board.

    With the change over to a new web site, and my personal focus shifted to Forth on the Propeller, I haven't had my hands full.

    Plus I've had a few outside projects, such as USA Income Tax regulations for publicly trade limited partners. That topic has eaten a couple of months of study this year. Reading tax code may be harder than computer code.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2013-09-12 10:58
    The Parallax Digital I/O Board has both a 74HC165 and a 74HC595 that you can use instead of the parallel interface to save on I/O pins. Any object that uses these ICs can be used on the board, which is why there is no custom object. If there is interest I can create an object that handles both shift registers at once with a simple call handling 8-bits in or out.
Sign In or Register to comment.