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\documentclass[11pt]{article} |
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%Gummi|065|=) |
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\usepackage{graphicx} |
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\usepackage{caption} |
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\usepackage{xcolor} |
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\usepackage[vcentering,dvips]{geometry} |
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\geometry{papersize={6in,9in},total={4.5in,6.8in}} |
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\title{\textbf{}} |
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\author{Steak Electronics} |
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\date{} |
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\begin{document} |
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\maketitle |
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%\tableofcontents |
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\textcolor{green!60!blue!70}{ |
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\section{60Hz Divider}} |
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\subsection{Counting the Hz} |
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pseudo code goal: |
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\begin{verbatim} |
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Using 1Hz signal |
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Start counting 1MHz every 1Hz |
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when next cycle is received, |
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display count |
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start counting again |
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\end{verbatim} |
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That's all the objective is here. Easy with a micro, but goal is to complete using cmos or 74 logic. |
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4553 x 5 |
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74hct132 |
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1MHz clock (or 6MHz clock), or some variation thereof |
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jk flip flop |
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74376 - quad jk flip flop |
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7476 - jk flip flop |
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1mhz clk will be main counter, |
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6 hz or 1 hz will be latch / reset |
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\subsection{MAX7219 8 digit 7 LED segment Display Driver} |
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Basic code tested with this was the LedControl arduino library. |
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/begin{verbatim} |
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/* |
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Now we need a LedControl to work with. |
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***** These pin numbers will probably not work with your hardware ***** |
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pin 12 is connected to the DataIn |
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pin 11 is connected to the CLK |
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pin 10 is connected to LOAD |
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We have only a single MAX72XX. |
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*/ |
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\end{verbatim} |
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Some of the lines have to be edited to allow for all digits to be read, and |
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also to lower intensity of display. I think also a component package (dark |
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grey clear plastic bag) in front of the leds with intensity 1 is about right. |
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\end{document} |
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