I put too much information in my block diagram and now the input and output don't look right.
Is there a way to put larger arrows? and also I would like to know if X(s) and Y(s) can be a little bit farther form the block.
Here is the code for the block diagram:
\begin{frame}{Desarrollo Diagrama en Bloques}
\centering
\tikzstyle{block} = [draw, fill=white, rectangle, minimum height=3em, minimum width=6em]
\tikzstyle{sum} = [draw, fill=white, circle, node distance=1cm]
\tikzstyle{input} = [coordinate]
\tikzstyle{output} = [coordinate]
\tikzstyle{pinstyle} = [pin edge={to-,thin,black}]
\begin{tikzpicture}[auto, node distance=2cm,>=latex']
%Declara los nodos
\node [input, name=input] {};
\node [block, right of=input] (Controller1) {$\frac{K}{s^2+s(1+[K*K_h]+K}$};
\node [output, right of=Controller1] (output) {};
%Ahora conectamos los bloques
\draw [draw,->] (input) -- node {$X(s)$} (Controller1);
\draw [->] (Controller1) -- node[name=y] {$Y(s)$}(output);
\end{tikzpicture}
\end{frame}
Thanks for your help.


