use newer template, add state machine subsection, improve some images

rpi/checklists/preamble.inc

+% vim: ft=tex
+%\documentclass[10pt, twocolumn]{article}
+
+\usepackage{booktabs}% def toprule, midrule and etc.
+%\usepackage[landscape]{geometry}
+%\usepackage[cm]{fullpage}
+\usepackage{tikz}
+\usepackage{environ}
+\usepackage{fancyhdr}
+\usepackage{amssymb}
+
+%\pagestyle{fancy}
+\fancyhead{}
+\fancyfoot{}
+\renewcommand{\headrulewidth}{0pt}
+\renewcommand{\footrulewidth}{0pt}
+
+% creates empty checkboxes to be used as the second
+% argument to \item on checklist
+\newcommand{\checkbox}{\makebox[3ex][r]{\Large{$\square$}}}
+
+% draws a dashed box around to group checklists
+% a task has a title, which is the group title
+\NewEnviron{task}[1]{\par
+\begin{tikzpicture}
+\node[rectangle,minimum width=0.9\linewidth] (m)
+  {\begin{minipage}{0.85\linewidth}
+    \begin{center}\uppercase{#1}\\\vspace{1em}\BODY\end{center}
+   \end{minipage}};
+\draw[dashed](m.south west) rectangle (m.north east);
+\end{tikzpicture}\vspace{1em}
+}
+
+% checklist env sets up a table and format the items.
+% in case a item has steps use the \step{asdf}
+% command.
+\newenvironment{checklist}[1]{%
+  \renewcommand{\item}[2]{%
+    ##1\hspace{2em}\dotfill\makebox{\uppercase{##2}}\\
+  }
+  \newcommand{\step}[1]{%
+    \hspace*{10em}-\hspace*{\labelsep}##1\\
+  }
+  \begin{tabular}{p{0.8\linewidth}}
+     \toprule
+       \multicolumn{1}{c}{\textbf{\uppercase{#1}}}\\
+     \midrule
+}{\bottomrule\end{tabular}\vspace{1em}}

rpi/pics/LED-polarity.svg

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