\usepackage{listings}
\usepackage{xcolor}

\lstset{ % General setup for the package
    language=C,
    basicstyle=\footnotesize\ttfamily,
    numbers=left,
     numberstyle=\small,
    frame=tb,
    tabsize=4,
    columns=fixed,
    showstringspaces=false,
    showtabs=false,
    keepspaces,
    commentstyle=\color{gray},
    keywordstyle=\color{blue}
}

\lstinputlisting[linerange={41-51}]{week4-4.ino}

\begin{lstlisting}
\end{lstlisting}