led digital clock 4 digit

Discussion in 'The Projects Forum' started by tibbles, Jan 2, 2009.

  1. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    hi all
    im building a digital car clock, i'm cheating a bit, i'm using a clock kit based on the PIC18c54. i rather fancied a blue display.i can get blue in common anode, but not the common cathodes used in the original design.
    there are only 7 anode lines (multiplexed)so would it be ok to use an inverter, or could the pic18c54 perhaps be set somehow to suit.?
    i would like to enable the display only when ignition is on perhaps the inverter could do this as well?

    any help much appreciated

    dougal
     
  2. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    ps i would like to use .56" 7 segments but cant find a uk stockist.
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    thanks bertus, i did check them out- no minimum order value, but shipping from the states.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    Perhaps you can use the type numbers to look at a closer supplier.

    Greetings,
    Bertus
     
  6. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    look like i might have found some at farnell, will work out quite expensive, as i can get clock module and ca display together at rapid,
    will have a think, in the meantime any thoughts on my inverter suggestion welcome.

    regards
    dougal
     
  7. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Why not look at the fuse box to see what you could tap into. There are lots of choise (but be careful), the clock shouldn't draw too much current.

    Shouldn't you be able to invert the output with software?
     
  8. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    ive just thought, if i invert the processor output, it will change the duty cycle drasticly.so thats probably no good.
     
  9. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    thanks bill, i,m not too good on processors,
     
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