[Tex/LaTex] Drawing switches in circuitikz with connectors (dots)

circuitikztikz-pgf

I'm trying to draw an example of the logical operation of a logic gate for an analog electronics report.
In the following code:

  \begin{circuitikz}
\draw (-3,0) to[battery] (-3,2);
\draw (-3,2) to[switch=${\rm s_1}$] (-1,2);
\draw (-1,2) to[switch=${\rm s_2}$] (1,2);
\draw (1,2) -- (1,2);
\draw (1,2) to[lamp=L] (1,0);
\draw (1,0) -- (-3,0);
\draw (-0.8,0) node[anchor=north] {$s_1$ \underline{and} $s_2=$ L};
\draw (0.62,1) node[anchor=east] {L};
\end{circuitikz}

I noticed that if I try and use to to[short, -*] for a connector before the switch command it disrupts the positioning of the switch itself. Is there a way to have connectors (black dots) at the base of the line where the switch would be connected?

M. Redaelli–

Hi, thank you for your answer. I tried the ospst command when i first compiled the image, but i wanted the arrows removed and the connectors in at the base of the line. I asked a question about removing the arrows and someone replied. He created the following:

%macro for switches without the arrows (cspst) and (ospst)
\makeatletter
%create the shape
\pgfcircdeclarebipole{}{\ctikzvalof{bipoles/interr/height 2}}{spst}{\ctikzvalof
{bipoles/interr/height}}{

\pgfsetlinewidth{\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgfstartlinewidth}  
\pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{0pt}}
\pgfpathlineto{\pgfpoint{.6\pgf@circ@res@right}{\pgf@circ@res@up}}
\pgfusepath{draw}
}

%make the shape accessible with nice syntax
\def\pgf@circ@spst@path#1{\pgf@circ@bipole@path{spst}{#1}}
\tikzset{switch/.style = {\circuitikzbasekey, /tikz/to path=\pgf@circ@spst@path, l=#1}}
\tikzset{spst/.style = {switch = #1}}
\makeatother

which worked well for the switch without the arrow. The reason I wanted to remove the arrows and add the connectors is because I am converting one of my electronics professor's hand written notes into tex files. I just discovered tikz and circuitikz, so I am very new to these environments. As a result I have tried to create style files for such a switch but I have not been successful.

Thank you for your time,

Jasper

P.S. I love CircuiTikz!

Best Answer

I think Jasper needs switches looking like the followings, but using a simple command for each one (am I right?). The nodes could be black also. Personally, I need the both.

\documentclass{article}
\usepackage[free-standing-units]{siunitx}
\usepackage{circuitikz}

\begin{document}

\begin{circuitikz}[scale=1.5]

\draw (0,0) to [V=E] (0,2)
to[short,-o](0.75,2);
\draw[ very thick](0.78,2)-- +(30:0.46);
\draw (1.25,2)to[short,o-](2,2)
to [C=$C$](2,0)
to [short,-o](1.25,0);
\draw [very thick] (1.22,0)--(0.77,0);
\draw (0.75,0)to [short,o-](0,0);

\end{circuitikz}

\end{document}

Which will result in:

Leonardo

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As is explained in How do I draw shapes inside a tikz node? pics can be used for defining new objects. My main problem using pics is how to place where you want because they aren't nodes and positioning them is not so easy.

Following code shows how to define EDFA block.

    EDFA/.pic={
        \begin{scope}[scale=.5]
        \draw (-1,0) coordinate (in) --  (-1,1) -- (1,0) coordinate (out) --  (-1,-1) -- cycle;
        \node[anchor=north,inner sep=2pt] at (0,-1) {$1$};
        \end{scope}

In this case, coordinate (-1,0) will act as west anchor and 1,0 as east. Both point will have an special name for further reference. Every pic is placed according its own origin (0,0). You can use Claudio's answer to Anchoring TiKZ pics for better positioning.

As your example was simple, I'd prefer to star with EDFA and place Source and Sink after it.

\documentclass[]{article}

% tikz
\usepackage{tikz}
\usetikzlibrary{positioning} %relative positioning

\begin{document}

\tikzset{%
    EDFA/.pic={
        \begin{scope}[scale=.5]
        \draw (-1,0) coordinate (in) --  (-1,1) -- (1,0) coordinate (out) --  (-1,-1) -- cycle;
        \node[anchor=north,inner sep=2pt] at (0,-1) {$1$};
        \end{scope}
    }
}

\begin{tikzpicture}[
block/.style={draw},
]

\draw pic (edfa) {EDFA};

\node[block, left=of edfain] (source) {Source};

\node[block, right= of edfaout] (sink) {Sink};

\draw[->] (source) -- (edfain);
\draw[->] (edfaout) -- (sink);

\end{tikzpicture}

\end{document}

I understand that your components are more complex than EDFA because for this particular case an isosceles triangle node with a label will do the work and it can be used as a node and not as a pic:

\documentclass[]{article}

% tikz
\usepackage{tikz}
\usetikzlibrary{positioning} %relative positioning
\usetikzlibrary{shapes.geometric}

\begin{document}

\begin{tikzpicture}[
    block/.style={draw},
    edfa/.style={isosceles triangle, minimum width=1cm, 
         draw, anchor=west, isosceles triangle stretches, 
         minimum height=1cm, label=-80:#1}
]

\node[block] (source) {Source};

\node[edfa=1, right=of source] (edfa) {};

\node[block, right= of edfa] (sink) {Sink};

\draw[->] (source) -- (edfa);
\draw[->] (edfa) -- (sink);

\end{tikzpicture}

\end{document}

Best Answer

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