\documentclass[../mainDocument.tex]{subfiles}
\section{Architektur und Integrationstests}
\subsection{Odroid}
\includegraphics[width=0.6\textwidth]{Odroid}

%\subsection{wtfSystemarchitektur}
%\includegraphics[width=0.6\textwidth]{Systemarchitektur}


\subsection{Object Oriented Analysis}
% Tikz Picture
\end{document}