365 day led clock

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

  1. SteveyD

    Thread Starter New Member

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


    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
    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.