\documentclass{standalone}
\usepackage{tikz}
\usepackage{siltex}
\usetikzlibrary {arrows.meta,positioning}
\tikzset{nodes={minimum height=0.6cm, text width=2.25cm, align=center,
draw=black!50, thick, font=\footnotesize, fill=white},
>={Stealth[round,sep]}, rounded corners, semithick}

\begin{document}
\begin{tikzpicture}[on grid,y=1.2cm,x=2.75cm]
    \node (mc) {Micro Controller};
    \node (ha)[left=0.5 of mc,draw=none,fill=none]{};
    \node (hb)[right=0.5 of mc,draw=none,fill=none]{};
    \node (sc)[below=1 of hb] {Stepper Controller};
    \node (sm)[below=1 of sc] {Stepper Motor};
    \node (sv)[below=1 of ha] {Servo Motor};
    \path[->] (mc) edge (sc)
              (mc) edge (sv)
              (sc) edge (sm);
\end{tikzpicture}
\end{document}
