Timer

Discussion in 'The Projects Forum' started by TAGMan, Jan 4, 2012.

  1. TAGMan

    Thread Starter New Member

    Apr 1, 2011
    1
    0
    Greetings and Happy New Year to all

    I am currently working on a timer project that is in the "concept only"stage. I need a clock; a time clock that will provide a unique digital output for every second of its timing function. I dont really need an output at the "seconds" level but the "minutes level is required. ie: a digital signature for every minute of the 24 hr cycle. Then I will decode the signature as needed to detect the time.
    Thanks,
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    You may want to explain why you can't use this solution, available everywhere for ~$8.
    [​IMG]
     
  3. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    DS1307 real time clock ic: http://datasheets.maxim-ic.com/en/ds/DS1307.pdf
     
  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Using a realtime clock, you could put the minutes through a hash function, so each of the 1,440 minutes would be an n-byte long string.

    Or you could simply number the minutes 0000-1439
     
  5. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    Depending on required accuracy, med a 555 IC, long term- count down 60 Hz line frequency. Connect 4 decade counters in series, 4017's. With a 4-input NAND gate decode 1440 for a common counter reset. Bring all outputs, except 1000's,& then just the 1000, to 31 positions of a solderless bread board. Use the other 4 in NAND to program any desired minute with just 4 jumpers.
     
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