[Tex/LaTex] How to switch the poles of the SPDT switch in circuitikz

circuitikztikz-pgf

I am drawing a circuit with circuitikz that have lots of SPDT switches.
I want to show the circuit at two different moments: once, when all the SPDT switches connected to out1 and the second with all of them to out2.
Is there any simple way to do this?

Here is a working example of what I am trying to code:

\documentclass[a4paper]{article}

\usepackage{amsmath}
\usepackage{tikz}
\usepackage{circuitikz}
\begin{document}


\begin{circuitikz}
    % Switches
    \draw (0,2) node[spdt,xscale=1,anchor=in] (Swp) {};
    \draw (0,0) node[spdt,xscale=-1,anchor=in] (Swc) {};
    \draw (0,-2) node[spdt,xscale=1,anchor=in] (Swn) {};

    % Capacitors
    \draw (Swp.in) to[C,l_=$(C_s + \Delta C)$] (Swc.in);
    \draw (Swn.in) to[C,l^=$(C_s - \Delta C)$] (Swc.in);

    % Voltages
    \draw (Swp.out 1) node[anchor=west] {$V_{in}^+$};
    \draw (Swn.out 1) node[anchor=west] {$V_{in}^-$};
    \draw (Swp.out 2) node[anchor=west] {$V_{cm}$};
    \draw (Swn.out 2) node[anchor=west] {$V_{cm}$};
    \draw (Swc.out 1) node[anchor=east] {$V_{cm}$};
    \draw (Swc.out 2) node[anchor=east] {$V_{ref}$};
\end{circuitikz}
\end{document}

Best Answer

Turn the appropriate values into a parameter-dependant values and use a conditional test:

\documentclass[a4paper]{article}
\usepackage{amsmath}
\usepackage{tikz}
\usepackage{circuitikz}

\def\mycircuit{%
    % Switches
    \draw (0,2) node[spdt,xscale=1,yscale=\value,anchor=in] (Swp) {};
    \draw (0,0) node[spdt,xscale=-1,yscale=\value,anchor=in] (Swc) {};
    \draw (0,-2) node[spdt,xscale=1,yscale=\value,anchor=in] (Swn) {};

    % Capacitors
    \draw (Swp.in) to[C,l_=$(C_s + \Delta C)$] (Swc.in);
    \draw (Swn.in) to[C,l^=$(C_s - \Delta C)$] (Swc.in);

    % Voltages
    \draw (Swp.out \myone) node[anchor=west] {$V_{in}^+$};
    \draw (Swn.out \myone) node[anchor=west] {$V_{in}^-$};
    \draw (Swp.out \mytwo) node[anchor=west] {$V_{cm}$};
    \draw (Swn.out \mytwo) node[anchor=west] {$V_{cm}$};
    \draw (Swc.out \myone) node[anchor=east] {$V_{cm}$};
    \draw (Swc.out \mytwo) node[anchor=east] {$V_{ref}$};
}

\newcommand\swapot[1]{%
\ifnum#1=1\relax
  \def\value{1}
  \def\myone{2}\def\mytwo{1}
\else
\ifnum#1=-1\relax
  \def\value{-1}
  \def\myone{1}\def\mytwo{2}
\fi\fi%
}
\begin{document}

\begin{circuitikz}
\swapot{1}
\mycircuit
\begin{scope}[xshift=5cm]
\swapot{-1}
\mycircuit
\end{scope}
\end{circuitikz}

\end{document}

enter image description here

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[Tex/LaTex] Opposite poles battery in circuitikz

The easiest way I can come up with is to simply reverse the direction in which you place the battery. So instead of \draw (0,0) to [battery, ...] (2,0) you use \draw (2,0) to [battery, ..] (0,0) (as is the case in the second example below).

If you do not want to reverse the direction in which you place the nodes, you could use rotate=180,transform shape option. This unfortunately also ends up producing a mirror image of the text, which can be remedied by applying a \rotatebox{180}{} to the voltage label (two 180 rotations of the text returns the text back to the original orientation). By default, this place the direction arrow at the bottom. If you desire this at the top, you can use \circuitikzbasekey/bipole/voltage/position =below as is the case in the examples below:

enter image description here

\documentclass{article}
\usepackage{tikz}
\usepackage{circuitikz}

\begin{document}
\begin{tikzpicture}
\draw (0,0) to [battery, v=$\varepsilon$] (2,0) node [right] {Default};
\end{tikzpicture}

\medskip
\begin{tikzpicture}
\draw (2,0) node [right] {Reverse  coordinates} to
    [battery, v=$\varepsilon$,
        \circuitikzbasekey/bipole/voltage/position = below] (0,0) ;
\end{tikzpicture}

\medskip

\begin{tikzpicture}
\draw (0,0) to 
    [rotate=180,transform shape,
        battery, v=\rotatebox{180}{$\varepsilon$},
        \circuitikzbasekey/bipole/voltage/position = below] (2,0) 
    node {Rotate text and symbol};
\end{tikzpicture}
\end{document}

[Tex/LaTex] How to invert the poles of an OP-AMP in circuitikz

You can use yscale=-1:

\documentclass{article}
\usepackage{circuitikz}

\begin{document}

\begin{circuitikz} 
  \draw (0,0) node[op amp] (opamp1) {}
  (opamp1.+) node[left ] {$v_+$}
  (opamp1.-) node[left ] {$v_-$};
  \draw (3,0) node[op amp,yscale=-1] (opamp2) {}
  (opamp2.+) node[left ] {$v_+$}
  (opamp2.-) node[left ] {$v_-$};
\end{circuitikz}

\end{document}

enter image description here

Best Answer

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[Tex/LaTex] Opposite poles battery in circuitikz

[Tex/LaTex] How to invert the poles of an OP-AMP in circuitikz

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