architecture.tex

\documentclass[tikz, border=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,fit,arrows.meta,backgrounds}

\tikzset{
  module/.style={
    draw, rounded corners,
    minimum width=2cm,
    minimum height=7mm,
    font=\sffamily
  },
  container/.style={
    draw, rounded corners,
    minimum width=2cm,
    minimum height=5cm,
    font=\sffamily
  },
  small/.style={
    draw, rounded corners,
    minimum height=2.5cm,
    font=\sffamily
  },
  >=LaTeX
}

\begin{document}
\begin{tikzpicture}[auto]
  \node[module] (Read) {Read from sensors};
  \node[module, below left=1cm and -1cm of Read] (Temp) {Temperature};
  \node[module, below right=1cm and -1cm of Read] (Power) {Power draw};
  \node[module, below=2.6cm of Read] (Queue) {Store in queue};
  \node[small,fit=(Read) (Temp) (Power) (Queue), draw, label={Arduino}] (SensorBox) {};
  \draw[->] (Read)--(Temp);
  \draw[->] (Read)--(Power);
  \draw[->] (Temp)--(Queue);
  \draw[->] (Power)--(Queue);

  % Raspberry Pi processing box
  \node[module, right=2cm of Read] (Camera) {Take picture};
  \node[module, below=of Camera] (CamProcess) {Process};
  \node[small, fit={(Camera) (CamProcess)}, draw] (Pi2Box) {};
  \draw[->] (Camera)--(CamProcess);

  % Data collection box
  \node[container, fit={(SensorBox) (Pi2Box)},
  draw, inner xsep=2mm, inner ysep=0.75cm,
  label={Data collection}] (DataCollectionBox) {};

  % Data processing box
  \node[module, right=2cm of Camera] (Data) {Data processing};
  \node[module, below=of Data] (Storage) {Storage};
  \node[small, fit={(Data) (Storage)},
        draw, inner sep=2mm,
        label={Data processing}]
        (MainBox) {};
  \draw[->] (Data)--(Storage);
  \draw[->] (DataCollectionBox)--(DataCollectionBox-|MainBox.west);

  % Serve box
  \node[module, right=2cm of Data] (Server) {Server};
  \node[module, below=of Server] (API) {API};
  \node[module, below=of API] (Website) {Website};
  \node[small, fit={(Server) (API) (Website)}, draw, inner sep=2mm, label={Serving}] (ServeBox) {};
  \draw[->] (Server)--(API);
  \draw[->] (Server) edge[bend left=52.5] node [left] {} (Website);
  \draw[->] (API)--(Website);
  \draw[->] (MainBox)--(MainBox-|ServeBox.west);

  % Raspberry pi box
  \node[container, fit={(CamProcess) (MainBox) (ServeBox)},
  draw, inner ysep=1cm, inner xsep=0.5cm,
  label={Raspberry Pi}] (RaspberryBox) {};
\end{tikzpicture}
\end{document}
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