Example: Seven-segment display

% Seven-segment display
% Author:  Germain Gondor
% Source: http://www.sciences-indus-cpge.apinc.org/Afficheur-7-Segments-avec-PGF-TIKZ
\documentclass{minimal}
% SevenSeg.sty can be downloaded from
% http://www.sciences-indus-cpge.apinc.org/Afficheur-7-Segments-avec-PGF-TIKZ
\usepackage{SevenSeg} 

\begin{document}


\begin{tikzpicture}[scale=0.8]
    \coordinate(A)at(-6em,0);
    \SSGLeg{A}
    \begin{scope}[xslant=0.1]
    \SSGNb{}{3}
    \SSGDCB{}
    \end{scope}
    \foreach \x in{0,...,1} {
        \fill[purple](-7em,-7em-\x*1em)circle(3pt)coordinate(B\x);
        \draw[purple,very thick](B\x)node[left]{$B_\x$}--++(14em,0)-|(Bit\x);
        \fill[purple](Bit\x|-B\x)circle(3pt);
    }
    \foreach \x in{2,...,3} {
        \fill(-7em,-7em-\x*1em)circle(3pt)coordinate(B\x);
        \draw[very thick](B\x)node[left]{$B_\x$}--++(14em,0)-|(Bit\x);
        \fill(Bit\x|-B\x)circle(3pt);
    }
\end{tikzpicture}
%
\begin{tikzpicture}[scale=0.75]
    \foreach \x in{0,...,3} {
        \coordinate (L\x) at({(\x-0)*2.5} ,-3*1);
        \SSGNb{L\x}{\x}
    }
    \foreach \x in{4,...,7} {
        \coordinate (L\x) at({(\x-4)*2.5} ,-3*2);
        \SSGNb{L\x}{\x}
    }
\end{tikzpicture}


\end{document}