Diagrama de Tikz: ángulo recto y espacio adicionales

Question

Estoy intentando recrear este diagrama:

El mío ya se ve bastante bien, pero a la conexión entre el nodo Environmenty Sensorle falta el segundo ángulo recto y espacio para el measured bytexto.

¿Cómo puedo hacer para agregar el espacio necesario al nodo?

Además, ¿es posible cargar un tikzdiagrama desde un archivo externo?

Este es el código para un MWE (Puedes jugar con él aquíhttps://www.overleaf.com/3051741jzxtvm#/8435913/)

\documentclass[tikz, border=10pt]{standalone}
\usepackage{verbatim}

\tikzset{
    vertex/.style = {
        circle,
        fill            = black,
        outer sep = 2pt,
        inner sep = 1pt,
    }
}
\begin{document}
\begin{tikzpicture}[node distance = 2cm, auto]
  [
    post/.style={->,shorten >=1pt,semithick}
  ]

  % Nodes
  \node[draw] (Sensor) at (2,0) {Sensor};
  \node[draw] (Comparator) at (6,0) {Comparator};
  \node[draw] (Actuator) at (10,0) {Actuator};
  \node[draw] (Feedback) at (13,2) {Feedback};
  \node[draw] (Environment) at (6,-2) {Environment};
  \node[draw] (Disturbances) at (6,-4) {Disturbances};

  \node at (1, 1) {\textbf{ Input}};
  \node at (11, 1) {\textbf{ Output}};

  \draw[->,draw=red] (Sensor) to node {alerts}  (Comparator);
  \draw[->,draw=red] (Comparator) to node {drives}  (Actuator);

  \draw[-, draw=red] (Actuator) -| node[pos=0.25] {affects} (Feedback);
  \draw[->, draw=red] (Feedback) |- (Environment);
  \draw[->, draw=red] (Environment) -| node {measured by}  (Sensor);
  \draw[<-,draw=red] (Environment) to node {affect}  (Disturbances);



\end{tikzpicture}
\end{document}

Answer 1

Una alternativa, que utiliza cadenas y posicionamiento de tikzlibrary:

\documentclass[tikz, border=10pt]{standalone}
        \usetikzlibrary{chains,positioning}
    \usepackage{verbatim}

    \begin{document}
        \begin{tikzpicture}[
    node distance = 2cm, auto,
      start chain = going right,
       box/.style = {rectangle, draw, on chain}]
    % Nodes
      \node[box] (Sensor)       {Sensor};
      \node[box] (Comparator)   {Comparator};
      \node[box] (Actuator)     {Actuator};
      \node[box,above right=of Actuator] (Feedback)     {Feedback};
      \node[box,below=of Comparator] (Environment)      {Environment};
      \node[box,below=of Environment] (Disturbances)    {Disturbances};
    % Lines  
      \draw[->,draw=red] (Sensor)     to node {alerts}  (Comparator);
      \draw[->,draw=red] (Comparator) to node {drives}  (Actuator);
      \draw[-, draw=red] (Actuator) -| node[pos=0.25] {affects} 
                                       node[pos=0.25,above=1cm] {\textbf{ Output}}   
                                       (Feedback);
      \draw[->,draw=red] (Feedback) |- (Environment);
      \draw[->,draw=red] (Environment) -| ([xshift=-2.4cm] Sensor.west) -- 
                                node[above] {measured by}  
                                node[above=1cm] {\textbf{ Input}}   (Sensor.west);
      \draw[<-,draw=red] (Environment) to node {affect}  (Disturbances);
        \end{tikzpicture}
    \end{document}

Answer 2

Tomado del código de ejemplo de Zarko

\documentclass[tikz, border=10pt]{standalone}
\usetikzlibrary{chains,positioning}
\usepackage{verbatim}
\usepackage{xcolor}
\DefineNamedColor{named}{BrickRed}      {cmyk}{0,0.89,0.94,0.28}
\DefineNamedColor{named}{DarkRed}       {cmyk}{0.4,0.89,0.94,0.28}
\renewcommand{\familydefault}{\sfdefault}


\begin{document}
\begin{tikzpicture}[
  node distance = 2cm, auto,
  start chain = going right,
  box/.style = {rectangle, draw, on chain}]
  \tikzset{>=latex}
  \tikzstyle{nodebox}=[box,draw=none,font=\bf]
  \tikzstyle{redline}=[-,BrickRed,draw=BrickRed,ultra thick]
  \tikzstyle{redliner}=[redline,->]
  \tikzstyle{redlinel}=[redline,<-]
  \tikzstyle{darklabel}=[below,DarkRed]

  % Nodes
  \node[nodebox] (Sensor)       {Sensor};
  \node[nodebox] (Comparator)   {Comparator};
  \node[nodebox] (Actuator)     {Actuator};
  \node[nodebox,above right=of Actuator] (Feedback)     {Feedback};
  \node[nodebox,below=of Comparator] (Environment)      {Environment};
  \node[nodebox,below=of Environment] (Disturbances)    {Disturbances};

  % Lines  
  \draw[redliner] (Sensor)     to node[darklabel] {alerts}  (Comparator);
  \draw[redliner] (Comparator) to node[darklabel] {drives}  (Actuator);
  \draw[redline] (Actuator) -| node[darklabel,pos=0.25] {affects} 
  node[pos=0.25,above=1em,DarkRed,font=\bf] {Output} (Feedback);
  \draw[redliner] (Feedback) |- (Environment);
  \draw[redliner] (Environment) -| ([xshift=-2.4cm] Sensor.west) -- 
  node[darklabel] {measured by}  
  node[above=1em,DarkRed,font=\bf] {Input}   (Sensor.west);
  \draw[redlinel] (Environment) to node[DarkRed] {affect}  (Disturbances);
\end{tikzpicture}

\end{document}

Answer 3

Aquí hay un truco rápido:

\draw[->, draw=red] (Environment) -| ($(Sensor)+(-3,0)$) 
  |- node[anchor=south west] {measured by} (Sensor);

necesitas agregar \usetikzlibrary{calc}al preámbulo.

($(Sensor)+(-3,0)$)agrega una coordenada adicional a la ruta. (-3,0)es el desplazamiento del (Sensor)nodo.

Actualizar(inspirado en la respuesta de Zarko)

En lugar de ($(Sensor)+(-3,0)$)puedes usar ([xshift=-2.4cm] Sensor.west). No es necesario incluir tikzbibliotecas adicionales.