\chapter{Appendix}
%
\section{Sensor PCB}

\begin{figure}
  % Requires \usepackage{graphicx}
  \includegraphics[width=0.9\textwidth]{sch}\\
  \caption{Sensor PCB schematic}\label{fig:pcb_sch}
\end{figure}

\begin{figure}
  % Requires \usepackage{graphicx}
  \centering
  \subfloat[]{
    \includegraphics[width=0.3\textwidth]{sens_TOP}
    \label{fig:sens_TOP}}
  \hfill
  \subfloat[]{
    \includegraphics[width=0.3\textwidth]{sens_midle}
    \label{fig:sens_midle}}
  \hfill
  \subfloat[]{
    \includegraphics[width=0.3\textwidth]{sens_bottom}
    \label{fig:sens_bottom}}
  \caption{Sensor PCB layout: top (a), middle (b) and bottom (c)}
\end{figure}

\section{Master PCB}

\begin{figure}
  % Requires \usepackage{graphicx}
  \includegraphics[width=0.9\textwidth]{sch}\\
  \caption{Sensor PCB schematic}\label{fig:pcb_sch}
\end{figure}

\begin{figure}
  % Requires \usepackage{graphicx}
  \centering
  \subfloat[]{
    \includegraphics[width=0.3\textwidth]{sens_TOP}
    \label{fig:sens_TOP}}
  \hfill
  \subfloat[]{
    \includegraphics[width=0.3\textwidth]{sens_midle}
    \label{fig:sens_midle}}
  \caption{Sensor PCB layout: top (a), middle (b) and bottom (c)}
\end{figure}
