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      60hz_Divider/datasheets/MAX7219-MAX7221.pdf
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      60hz_Divider/docs/4.tex

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60hz_Divider/datasheets/MAX7219-MAX7221.pdf View File


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60hz_Divider/docs/4.tex View File

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

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