Ponte di Wheatstone in tikz e utilizzo come simbolo

Si hai ragione, mi sono dimenticato di dire che uso circuitikz. Standalone nel senso che lo volevo integrare più volte all’interno del disegno.
ho provato questo:
`
\begin{circuitikz}[scale=0.7]
\ctikzset { bipoles/resistor/height =.1}
\ctikzset { bipoles/resistor/width =.2}

\tikzset
{wheatstone/.pic={
\draw(1,1.9) to[R] (0.1,1) to[R] (1,0.1);
\draw (1,1.9) to[R] (1.9,1) to[R] (1,0.1);
\draw[thick] (0,0) rectangle (2,2);
}
}

\pic [scale=1] at (5,5) {wheatstone};
`
Quello che succede è quando inserisco il “blocchettino” questo diventa molto più grande di come l’ho dimensionato io nel pic, e quindi quando lo devo scalare non ci raccapezzo niente!

Grazie
Marco

Hai ragione, scusa!
Ecco il codice:
`\documentclass[a4paper,10pt,twocolumn,conference]{IEEEtran}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

%\usepackage{cite,subfigure}
\usepackage{graphicx}
\usepackage{color}
\usepackage{amsmath,amsfonts,amssymb,bm,latexsym,txfonts,units}
%\usepackage[amssymb,italian,mediumspace,cdot]{SIunits}
\usepackage[binary-units]{siunitx}
\usepackage{booktabs}
\usepackage{dcolumn}
\usepackage{multicol}
\usepackage{multirow}

\usepackage{pgfplots}
\pgfplotsset{/pgf/number format/use comma,compat=newest}
\usetikzlibrary{calc}
\usepackage{circuitikz}
\usepackage{xcolor}
\usetikzlibrary{shapes.geometric}

\usepackage{subfig}

\def\antenna{%
— +(0mm,4.0mm) — +(2.625mm,7.5mm) — +(-2.625mm,7.5mm) — +(0mm,4.0mm)
}

\title{prova}

\DeclareSIUnit{\dBm}{\decibel{}\milli}
\DeclareSIUnit{\dBd}{\decibel{}d}
\DeclareSIUnit{\dBw}{\decibel{}\watt}

\author{%
\IEEEauthorblockN{qqq}%
\IEEEauthorblockA{0000}
}

\begin{document}

\maketitle
\pagestyle{empty}

\begin{figure*}
\centering

\begin{circuitikz}[scale=0.7]
\ctikzset { bipoles/resistor/height =.1}
\ctikzset { bipoles/resistor/width =.2}
\ctikzset { bipoles/twoport/height =.4}
\ctikzset { bipoles/twoport/width =.4}

\ctikzset { bipoles/amp/width =.4}
%\ctikzset { bipoles/amp/height =.5}
\ctikzset { bipoles/lowpass/width =.4}
%\ctikzset { bipoles/lowpass/height =.5}

\tikzset
{wheatstone/.pic={
\draw(1,1.9) to[R] (0.1,1) to[R] (1,0.1);
\draw (1,1.9) to[R] (1.9,1) to[R] (1,0.1);
\draw[thick] (0,0) rectangle (2,2);
}
}

\draw[help lines,pink] (0,0) grid (20,11);
\node

at (19,10.25) {\footnotesize{Hive Node}};
\draw [thick] (1,1) rectangle (19,10);

% Kinetis
\draw[rounded corners, thick, fill=orange, fill opacity=.2] (8,5) rectangle (12,9);
\node at (10,7.25) {\footnotesize{a}};
\node at (10,6.75) {\footnotesize{b}};

% Acc
\draw[thick, fill=green, fill opacity=.2] (2,6.1) rectangle (3,8.9);
\node [rotate=90] at (2.5,7.5) {\footnotesize{Accelerometer}};

% Microphone
\draw[thick,fill=yellow, fill opacity=0.2] (17.5,3.5) circle (.4);
\draw[thick] (17.9,3.1) rectangle (17.9,3.9);
\draw[thick,fill=yellow, fill opacity=0.2] (17.5,2.5) circle (.4);
\draw[thick] (17.9,2.1) rectangle (17.9,2.9);

% Load Cells
\pic [scale=1] at (17.1,5.1) {wheatstone};

% T&H
\draw[thick, fill=blue, fill opacity=.2] (1.5,2) rectangle (2.5,3);
\node at (2,2.75) {\scriptsize{T\&H}};
\node at (2,2.25) {\scriptsize{1}};
\draw[latex-latex] (2,3) — (2,4);

\draw[thick, fill=blue, fill opacity=.2] (3,2) rectangle (4,3);
\node at (3.5,2.75) {\scriptsize{T\&H}};
\node at (3.5,2.25) {\scriptsize{2}};
\draw[latex-latex] (3.5,3) — (3.5,4);

\node at (4.5,2.5) {\scriptsize{$\cdots$}};

\draw[thick, fill=blue, fill opacity=.2] (5,2) rectangle (6,3);
\node at (5.5,2.75) {\scriptsize{T\&H}};
\node at (5.5,2.25) {\scriptsize{16}};
\draw[latex-latex] (5.5,3) — (5.5,4);

\draw

% Accellerometer
(3.5,8.5) to[amp,n=amp1,>] ++(2,0)
(3.5,7.5) to[amp,n=amp2,>] ++(2,0)
(3.5,6.5) to[amp,n=amp3,>] ++(2,0)
(amp1.east) to[lowpass,n=lp1,>] ++(2,0)
(amp2.east) to[lowpass,n=lp2,>] ++(2,0)
(amp3.east) to[lowpass,n=lp3,>] ++(2,0)
(lp1.east) to[short,i=x] (8,8.5)
(lp2.east) to[short,i=y] (8,7.5)
(lp3.east) to[short,i=z] (8,6.5)
(amp1.west) — (3,8.5)
(amp2.west) — (3,7.5)
(amp3.west) — (3,6.5)

% Load Cell
(16.5,8.5) to[amp,n=ampLC1,>] ++(-2,0)
(16.5,7.5) to[amp,n=ampLC2,>] ++(-2,0)
(16.5,6.5) to[amp,n=ampLC3,>] ++(-2,0)
(16.5,5.5) to[amp,n=ampLC4,>] ++(-2,0)
(ampLC1.east) to[lowpass,n=lpLC1,>] ++(-2,0)
(ampLC2.east) to[lowpass,n=lpLC2,>] ++(-2,0)
(ampLC3.east) to[lowpass,n=lpLC3,>] ++(-2,0)
(ampLC4.east) to[lowpass,n=lpLC4,>] ++(-2,0)

% Microphone
(16.5,3.5) to[amp,n=ampMIC1,>] ++(-2,0)
(16.5,2.5) to[amp,n=ampMIC2,>] ++(-2,0)
(ampMIC1.east) to[lowpass,n=lpMIC1,>] ++(-2,0)
(ampMIC2.east) to[lowpass,n=lpMIC2,>] ++(-2,0)
(ampMIC1.west) — (17.1,3.5)
(ampMIC2.west) — (17.1,2.5)
;

\draw[-latex] (lpMIC1.east) -| (11.5,5);
\draw[-latex] (lpMIC2.east) -| (11,5);

% Connection for I2C
\node [above] at (4.5,4) {\scriptsize{I2C}};
\draw[latex-latex] (1.5,4) -| (8.5,5);

\end{circuitikz}
\caption{probvaa}
\label{fig:node}
\end{figure*}

\end{document}`

Quando metto lo [scale=0.7] il ponte diventa molto più grande, altrimenti tutto funziona!!
Come è possibile?

Grazie
Marco