365 day led clock

Discussion in 'The Projects Forum' started by SteveyD, Jan 20, 2008.

  1. SteveyD

    Thread Starter New Member

    Jan 20, 2008
    6
    0
    Looking for some help on this please.

    http://www.kmitl.ac.th/~kswichit/Led/Led.html

    Taking the LED segments from that schem, and use a PIC 16F627 to drive them as a clock.. what else would I need to change?

    The 595's would be taken out, the ULN2003 would stay to drive the led segments.

    I would need more outputs to control the Common Cathodes from the PIC, would I need to place a ULN2003 on those outputs as well?
     
  2. eeboy

    Active Member

    Sep 27, 2007
    90
    1
    If you are going to have multiple digits you need some way of enabling each digit. For this I would utilize a single P-channel FET on the annode. This would mean relocating the current limiting resistors to the cathode (just prior to the 2003) then tie all the lines together in a common anode configuration.
     
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