Rotate voltmeter CircuiTikz

Question

I'm using Latex and CircuiTikz to draw circuits but I can't rotate de voltmeter without making a disaster. Any idea? Here is an example.

\begin{circuitikz}
\draw
(0,0) to[ammeter] (3,0)
      to (4,0)
      to[lamp] (4,-2)
      to (0,-2)
      to[sV] (0,0);
\draw (3,0) to[voltmeter] (3,-2);
\end{circuitikz}

Answer 1

I see that in the last version of circuitikz, the definitions for ammeter and voltmeter have been changed, so if your version is 0.3.0 or newer, use the following code. If you don't need the diagonal arrow, comment the last two \pgfusepath{draw}. However I notice that now the circles don't touch the wires (I wonder why). If you want to correct this behaviour, replace the lines

\pgfpathcircle{\pgfpointorigin}{.9\pgf@circ@res@up}
<...>
\pgfpathlineto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@up}}

with

\pgfpathcircle{\pgfpointorigin}{\pgf@circ@res@up}
<...>
\pgfpathlineto{\pgfpoint{-1.06\pgf@circ@res@other}{1.06\pgf@circ@res@up}}

but then you have to do the same in the ammeter definition.

\documentclass{standalone}
\usepackage{circuitikz}
\makeatletter
\def\pgf@circ@myvoltmeter@path#1{\pgf@circ@bipole@path{myvoltmeter}{#1}}
\tikzset{myvoltmeter/.style = {\circuitikzbasekey, /tikz/to
                               path=\pgf@circ@myvoltmeter@path}}
\pgfcircdeclarebipole{}{\ctikzvalof{bipoles/voltmeter/height}}{myvoltmeter}{\ctikzvalof{bipoles/voltmeter/height}}{\ctikzvalof{bipoles/voltmeter/width}}{
    \def\pgf@circ@temp{right}
    \ifx\tikz@res@label@pos\pgf@circ@temp
        \pgf@circ@res@step=-1.2\pgf@circ@res@up
    \else
        \def\pgf@circ@temp{below}
        \ifx\tikz@res@label@pos\pgf@circ@temp
            \pgf@circ@res@step=-1.2\pgf@circ@res@up
        \else
            \pgf@circ@res@step=1.2\pgf@circ@res@up
        \fi
    \fi

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@zero}}       
    \pgfpointorigin \pgf@circ@res@other =  \pgf@x  \advance \pgf@circ@res@other by -\pgf@circ@res@up
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@zero}}
    \pgfusepath{draw}

    \pgfsetlinewidth{\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgfstartlinewidth}

        \pgfscope
            \pgfpathcircle{\pgfpointorigin}{.9\pgf@circ@res@up} % change this if you want to touch the wires
            \pgfusepath{draw}       
        \endpgfscope    

    \pgfsetlinewidth{\pgfstartlinewidth}
    \pgftransformrotate{90}
    \pgfsetarrowsend{latex}
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@down}}
    \pgfpathlineto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@up}} % change this if you want to touch the wires
    \pgfusepath{draw} % comment this if you don't need the diagonal arrow
    \pgfsetarrowsend{}


    \pgfpathmoveto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@zero}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@zero}}
    \pgfusepath{draw} % comment this if you don't need the diagonal arrow

    \pgfnode{circle}{center}{\textbf{V}}{}{}
}
\makeatother
\begin{document}
\begin{circuitikz}
\draw
(0,0) to[ammeter] (3,0)
      to (4,0)
      to[lamp] (4,-2)
      to (0,-2)
      to[sV] (0,0);
\draw (3,0) to[myvoltmeter] (3,-2);
\end{circuitikz}
\end{document}

Answer 2

There is a simpler scheme to achieve the goal. A proposed approach that defines a mymeter command taking 2 arguments \#1=name, \#2=angle of rotation. Basically it redefines the voltmeter by drawing a mymeter that has the rotation ability.

\newcommand{\mymeter}[2] 
{  % #1 = name , #2 = rotation angle
\begin{scope}[transform shape,rotate=#2]
\draw[thick] (#1)node(){$\mathbf V$} circle (11pt);
\draw[rotate=45,-latex] (#1)  +(-17pt,0) --+(17pt,0);
\end{scope}
}

Code

\documentclass[border=1cm,varwidth]{standalone}  
\usepackage{tikz,amsmath}
\usepackage[american,siunitx]{circuitikz}
\usetikzlibrary{arrows}

\newcommand{\mymeter}[2] 
{  % #1 = name , #2 = rotation angle
\begin{scope}[transform shape,rotate=#2]
\draw[thick] (#1)node(){$\mathbf V$} circle (11pt);
\draw[rotate=45,-latex] (#1)  +(-17pt,0) --+(17pt,0);
\end{scope}
}

\begin{document}

OP's circuit:

\medskip

\begin{circuitikz}
\draw
(0,0) to[ammeter] (3,0)
      to (4,0)
      to[lamp] (4,-2)
      to (0,-2)
      to[sV] (0,0);
\draw (3,0) to[voltmeter] (3,-2);
\end{circuitikz}

\medskip

Result of proposed approach:

\medskip

\begin{circuitikz}
\draw
(0,0) to[ammeter] (3,0)
      to (4,0)
      to[lamp] (4,-2)
      to (0,-2)
      to[sV] (0,0);
\draw (3,0) to[voltmeter,color=white,name=M](3,-2);
\mymeter{M}{0}  % try 90, 0, -90
\end{circuitikz}
\end{document}

Answer 3

With Version 0.9.5 (Oct 12, 2019), This is possible with rmeter (Round meter)

\begin{circuitikz}
    \draw
    (0,0) to[ammeter] (3,0)
    to (6,0)
    to[lamp] (6,-2)
    to (0,-2)
    to[sV] (0,0);
    \draw (3,0) to[voltmeter] (3,-2);
    \draw
    (4,0) to[rmeter, n=rm1] (4,-2)
    (rm1.center) node [anchor=center] () {V}
    ;
    \draw
    (5,0) to[rmeterwa, n=rm2] (5,-2)
    (rm2.center) node [anchor=center] () {A}
    ;
\end{circuitikz}