parallel port adaptor

Discussion in 'The Projects Forum' started by maxs, Oct 28, 2012.

  1. maxs

    Thread Starter New Member

    Aug 5, 2009
    7
    0
    ok to let you know what im trying to do i built a parallel port adaptor that came with software to reset a laptop battery to its original state the problem is the schematic called for an 74ls05 i didnt have i did some research and found that the hex inverter i had may work in its place (74hc04) the soft ware detects to programmer but trying to read the battery eeprom keeps saying no battery detected so could it be my hex inverter causing the fault?

    and i know the dangers in doing battery rebuilding this is just a project i started to see if it were possable/cost effective

    here is the one i built

    thanks for any help
     
  2. JohnInTX

    Moderator

    Jun 26, 2012
    2,348
    1,029
    I2C requires open collector drivers like the '05. The '04 is a totem pole and actively drives high as well as low. That can raise issues with the ACK/NAK and clock stretching.
     
  3. maxs

    Thread Starter New Member

    Aug 5, 2009
    7
    0
    thanks for the reply ive ordered some 05s
     
Loading...