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element14 presents Forum DIY Discrete Logic LED Countdown Timer
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DIY Discrete Logic LED Countdown Timer

evo
evo 4 months ago

Hey everyone, I'm trying to create a countdown system, but I'm having trouble understanding how everything works together. I'm not really sure how to chain the parts properly. Could someone please show me a clear schematic or example of how to connect everything step by step?

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  • beacon_dave
    beacon_dave 4 months ago +3 suggested
    I'm assuming that you are referring to the element 14 Presents timer project ? /challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode…
  • beacon_dave
    beacon_dave 4 months ago +2
    Start with the clock circuit: and connect the 1Hz output (top right) to the Clk input (middle left) of the 1's counter: Then connect the CarryOut (lower right) to the Clk input (upper middle left…
  • evo
    evo 4 months ago in reply to beacon_dave +1
    do you know what the full one is with everyting
  • beacon_dave
    beacon_dave 4 months ago in reply to evo +1
    Yes, but I think you need to remove the reset logic on the 1's counter for the minutes and the 1's counter for the hours as they will need to show 0-9 and not 0-5.
  • beacon_dave
    beacon_dave 4 months ago in reply to evo +1
    It looks like you are almost there. It is perhaps time to start building a prototype on some breadboard to help understand the circuit. If you start with one decade counter connected to one display driver…
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  • beacon_dave
    0 beacon_dave 4 months ago

    I'm assuming that you are referring to the element 14 Presents timer project ?

    /challenges-projects/element14-presents/project-videos/w/documents/5402/diy-discrete-logic-led-countdown-timer----episode-509

    If so, there are some schematics here:

    https://github.com/surbhika-rastogi/Digital-Countdown-Timer-without-microcontroller/tree/main/schematics

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  • evo
    0 evo 4 months ago in reply to beacon_dave

    do you know what the full one is with everyting

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  • beacon_dave
    0 beacon_dave 4 months ago in reply to evo

    The filenames with the '.pro' file extensions will be the KiCad project files.

    • 1HzClock.pro
    • Countdown Timer.pro
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  • beacon_dave
    0 beacon_dave 4 months ago in reply to evo

    The filenames with the '.pro' file extensions will be the KiCad project files.

    • 1HzClock.pro
    • Countdown Timer.pro
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