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+\documentclass[12pt, a4paper, dutch]{article}
+
+% tikz is ugly, i don't bother making clean LaTeX code
+
+\usepackage[margin=1in]{geometry}
+\usepackage{circuitikz}
+\usepackage{float}
+\usepackage{babel}
+\usepackage{siunitx}
+\usepackage{amsmath}
+\usepackage{scalerel}
+\usepackage{csquotes}
+\usepackage{parskip}
+\usepackage{unicode-math}
+\usepackage{fontspec}
+\usepackage{tabularx}
+\usepackage{booktabs}
+\usepackage{graphicx}
+\usepackage{pgfplots}
+\usepackage{color}
+\usepackage{hyperref}
+
+\setmainfont{TeX Gyre Schola}
+\setmathfont{TeX Gyre Schola Math}
+\setmonofont{JetBrainsMono Nerd Font}
+\sisetup{
+	group-separator = {.},
+	output-decimal-marker = {,}
+}
+
+\pgfplotsset{compat=newest}
+
+\usetikzlibrary{calc}
+\usetikzlibrary{shapes.geometric}
+\usetikzlibrary{arrows.meta,arrows}
+\usetikzlibrary{positioning}
+\tikzset{
+	initial/.style={circle, fill},
+	final/.style={solid, double=white, circle, fill, thick, draw},
+	decision/.style={diamond, black, draw},
+	action/.style={rectangle, draw, rounded corners, align=center},
+	arrow/.style={draw, -{Latex[length=3mm]}, thick, rounded corners}
+}
+
+\bigskipamount=7mm
+\medskipamount=4mm
+\parindent=0mm
+
+\begin{document}
+
+\begin{center}
+\textbf{Software ontwerp} \hspace{2mm} project Simon \hfill \textbf{Loek Le Blansch} (2180996)
+\\\smallskip
+\today
+\end{center}
+
+\medskip
+
+Dit document maakt gebruik van hyperlinks, dus je kunt klikken op de blokken met
+\emph{benadrukte tekst} om naar de definitie van dat blok te gaan.
+
+\section*{Overzicht}\label{overzicht}
+\begin{center}
+\begin{tikzpicture}[node distance=1.5cm]
+\node[initial] (initial) at (0,0) {};
+\node[action, below of = initial] (setup) {\hyperref[init]{\emph{Initialisatie}}};
+\node[action, below of = setup] (loop) {\hyperref[loop]{\emph{Loop}}};
+
+\draw [arrow] (initial) -- (setup);
+\draw [arrow] (setup) -- (loop);
+\draw [arrow] (loop) -- ++(0, -1) -- ++(-2, 0) -- ++(0, 1) -- (loop);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Initialisatie}\label{init}
+\begin{center}
+\begin{tikzpicture}[node distance=1.5cm]
+\node[initial] (initial) at (0,0) {};
+
+\node[action, below = 1cm of initial] (mkvars) {Maak globale variabelen voor de
+	goede\\combinatie en om bij te houden\\hoeveel beurten zijn verlopen.};
+
+\node[action, below = 1cm of mkvars] (outputs) {Configureer de output pins};
+\node[action, below of = outputs] (inputs) {Configureer de input pins};
+
+
+\node[action, below of = inputs] (bootanimation) {Weergeef de opstart animatie};
+
+\node[action, below of = bootanimation] (waitready) {Laat de groene led knipperen
+	terwijl\\er gewacht wordt op de gebruiker};
+
+\node[action, below of = waitready] (simonsays) {Laat de eerste noot van de
+	combinatie zien en horen};
+
+\node[final, below of = simonsays] (final) {};
+
+\draw [arrow] (initial) -- (mkvars);
+\draw [arrow] (mkvars) -- (outputs);
+\draw [arrow] (outputs) -- (inputs);
+\draw [arrow] (inputs) -- (bootanimation);
+\draw [arrow] (bootanimation) -- (waitready);
+\draw [arrow] (waitready) -- (simonsays);
+\draw [arrow] (simonsays) -- (final);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Loop}\label{loop}
+\begin{center}
+\begin{tikzpicture}[node distance=2cm]
+\node[initial] (initial) at (0,0) {};
+
+\node[decision, below of = initial] (begin) {};
+
+\node[action, below of = begin] (scanbn)
+	{\hyperref[bnscan]{\emph{Scan de knoppen}}};
+\node[action, below of = scanbn] (bngenerator)
+	{\hyperref[onbn]{\emph{Event generator}}};
+
+\draw [arrow] (initial) -- (begin);
+\draw [arrow] (begin) -- (scanbn);
+\draw [arrow] (scanbn) -- (bngenerator);
+
+\draw [arrow] (bngenerator) -- ++(0, -1) -- ++(-2.5, 0) |- (begin);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Knoppen scan}\label{bnscan}
+\begin{center}
+\begin{tikzpicture}[node distance=1.5cm]
+
+\node[initial] (initial) at (0,0) {};
+
+\node[action, below of = initial] (mvarr)
+	{kopi\"eer \texttt{bn\_state} naar \texttt{bn\_state\_old}};
+
+\node[action, below of = mvarr] (ie0) {Stel i in op 0};
+\node[decision, below of = ie0,
+	label={above left:[$i<4$]}] (iloopstart) {};
+
+\node[action, below of = iloopstart] (checkpin)
+	{Sla de huidige waarde van pin\\\texttt{clockwise\_buttons[i]} op in
+	\texttt{bn\_state[i]}};
+
+\node[action, below of = checkpin] (ip1)
+	{Verhoog 1 met 1};
+
+\node[decision, below of = ip1] (iloopend) {};
+
+\node[final, below of = iloopend] (final) {};
+
+
+\draw [arrow] (initial) -- (mvarr);
+\draw [arrow] (mvarr) -- (ie0);
+\draw [arrow] (checkpin) -- (ip1);
+\draw [arrow] (iloopend) -- (final);
+
+\draw [arrow] (iloopstart) node[below right]{[ja]} -- (checkpin);
+
+\draw [arrow] (ie0) -- (iloopstart);
+
+\draw [arrow] (iloopstart) -- node[above]{[nee]} ++(5.0, 0) |- (iloopend);
+
+\draw [arrow] (ip1) -- ++(0, -1) -- ++(-5.0, 0) |- (iloopstart);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Event generator}\label{onbn}
+\begin{center}
+\begin{tikzpicture}[node distance=1.5cm]
+\node[initial] (initial) at (0,0) {};
+
+\node[action, below of = initial] (ie0) {Stel i in op 0};
+\node[decision, below of = ie0,
+	label={above left:[$i < 4$]}] (iloopstart) {};
+\node[decision, below = 2cm of iloopstart,
+	label={above left:[bn\_state[i] == bn\_state\_old[i]]}] (bndiff) {};
+\node[action, below = 1cm of bndiff] (makestruct)
+	{Maak een struct met\\informatie over de toets};
+\node[action, below = 1cm of makestruct] (bnhandl)
+	{\hyperref[bneventhandler]{\emph{Event handler}}\\(krijgt struct mee)};
+\node[decision, below of = bnhandl] (merge) {};
+\node[action, below of = merge] (ip1)
+	{Verhoog i met 1};
+\node[decision, below of = ip1] (iloopend) {};
+
+\node[final, below of = iloopend] (final) {};
+
+\draw [arrow] (initial) -- (ie0);
+\draw [arrow] (ie0) -- (iloopstart);
+
+\draw [arrow] (ip1) -- ++(0, -0.7) -- ++(-6.7, 0) |- (iloopstart);
+\draw [arrow] (ie0) -- (iloopstart);
+\draw [arrow] (iloopstart) node[below right]{[ja]} -- (bndiff);
+\draw [arrow] (iloopstart) -- node[above]{[nee]} ++(3.6, 0) |- (iloopend);
+
+\draw [arrow] (bndiff) -- node[above]{[ja]} ++(3, 0) |- (merge);
+\draw [arrow] (bndiff) node[below right]{[nee]} -- (makestruct);
+
+\draw [arrow] (makestruct) -- (bnhandl);
+\draw [arrow] (bnhandl) -- (merge);
+\draw [arrow] (merge) -- (ip1);
+\draw [arrow] (iloopend) -- (final);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Event handler}\label{bneventhandler}
+\begin{center}
+\begin{tikzpicture}[node distance=2.5cm]
+
+\node[initial] (initial) at (0,0) {};
+
+\node[action, below of = initial] (debounce)
+	{Kijk of er meer dan 250ms tussen\\deze en de vorige toetsaanslag zit\\en sla dit
+	op in \texttt{debounce}};
+
+\node [decision, below = 2cm of debounce,
+	label={[align=right]left:{[ignore\_input]\\of\\{}[key up
+	event]\\of\\{}[debounce]}}] (fastreturn) {};
+
+\node[action, below = 2cm of fastreturn] (av)
+	{Licht de ingedrukte knop op\\en laat een toon horen};
+
+\node[action, below = 1cm of av] (ignoreinput)
+	{Stel een timer in om alle invoer\\voor 200 milliseconden te negeren};
+
+\node[action, below = 1cm of ignoreinput] (checkkp)
+	{\hyperref[checkkeypress]{\emph{Controleer of de knop goed is}}};
+
+\node[final, below of = checkkp] (final) {};
+
+\draw [arrow] (initial) -- (debounce);
+\draw [arrow] (debounce) -- (fastreturn);
+\draw [arrow] (fastreturn) -- node[midway,above]{[ja]} ++(5, 0) |- (final);
+\draw [arrow] (fastreturn) -- node[below right]{[nee]} (av);
+\draw [arrow] (av) -- (ignoreinput);
+\draw [arrow] (ignoreinput) -- (checkkp);
+\draw [arrow] (checkkp) -- (final);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Controleer of de knop goed is}\label{checkkeypress}
+\begin{center}
+\begin{tikzpicture}[node distance=1.5cm]
+
+\node[initial] (initial) at (0,0) {};
+
+\node [decision, below = 2cm of initial,
+	label={left:{[combinatie[toets\_index] != toets]}}] (fastreturn1) {};
+
+\node[action, below right = 5mm and 2cm of fastreturn1] (badpressroutine)
+	{\hyperref[badpressroutine]{\emph{Maak de gebruiker verdrietig}}};
+
+\node [decision, below = 2cm of fastreturn1,
+	label={left:{[toets\_index == zet\_index]}}] (fastreturn2) {};
+
+\node[action, below right = 5mm and 1cm of fastreturn2] (turnnumberpp)
+	{Verhoog zet\_index met 1};
+
+\node[action, below of = turnnumberpp] (ennume0)
+	{Stel toets\_index in op 0};
+
+\node[action, below of = ennume0] (newcomb)
+	{Laat de langere cominatie zien};
+
+\node [decision, below of = newcomb] (comb1) {};
+
+\node[action, below = 5cm of fastreturn2] (ennumpp)
+	{Verhoog toets\_index met 1};
+
+\node[final, below of = ennumpp] (final) {};
+
+\draw [arrow] (initial) -- (fastreturn1);
+\draw [arrow] (fastreturn1) -| node[above left]{[ja]} (badpressroutine);
+\draw [arrow] (fastreturn2) -| node[above left]{[ja]} (turnnumberpp);
+\draw [arrow] (turnnumberpp) -- (ennume0);
+\draw [arrow] (ennume0) -- (newcomb);
+\draw [arrow] (newcomb) -- (comb1);
+\draw [arrow] (fastreturn1) -- node[below right]{[nee]} (fastreturn2);
+\draw [arrow] (fastreturn2) -- node[below right]{[nee]} (ennumpp);
+\draw [arrow] (badpressroutine) |- ++(2, -0.8) |- (comb1);
+\draw [arrow] (ennumpp) -- (final);
+\draw [arrow] (comb1) |- (final);
+
+\end{tikzpicture}
+\end{center}
+
+
+\section*{Verkeerde knop routine}\label{badpressroutine}
+\begin{center}
+\begin{tikzpicture}[node distance=1.5cm]
+
+\node[initial] (initial) at (0,0) {};
+
+\node[action, below of = initial] (av)
+	{Laat de lampjes knipperen en\\een pieptoon klinken voor 2 seconden};
+
+\node[action, below of = av] (resetvars)
+	{Stel toest\_index en zet\_index in op 0};
+
+\node[action, below of = resetvars] (newcomb)
+	{Maak een nieuwe combinatie\\van willekeurige toetsen};
+
+\node[action, below of = newcomb] (showcomb)
+	{Laat de combinatie zien};
+
+\node[final, below of = showcomb] (final) {};
+
+\draw [arrow] (initial) -- (av);
+\draw [arrow] (av) -- (resetvars);
+\draw [arrow] (resetvars) -- (newcomb);
+\draw [arrow] (newcomb) -- (showcomb);
+\draw [arrow] (showcomb) -- (final);
+
+\end{tikzpicture}
+\end{center}
+
+
+\end{document}