made a load of stuff

1 files changed, 236 insertions, 49 deletions

diff --git a/electronics/cw1/writeup.tex b/electronics/cw1/writeup.tex
index f92c0dd..106ce19 100644
--- a/electronics/cw1/writeup.tex
+++ b/electronics/cw1/writeup.tex
@@ -1,68 +1,255 @@
 \documentclass[a4paper,12pt]{article}
 
-\usepackage{geometry}
-\usepackage{titling}
+\usepackage[backend=bibtex]{biblatex} 
+\usepackage{geometry} 
+\usepackage{titling} 
 \usepackage{titlesec}
-\usepackage[english]{babel}
-\usepackage[hidelinks]{hyperref}
-\usepackage{listings}
+\usepackage[english]{babel} 
+\usepackage[hidelinks]{hyperref} 
+\usepackage{listings} 
 \usepackage{xcolor}
-\usepackage{graphicx}
-\usepackage{forest}
-\usepackage{tikz-qtree}
-\usepackage{setspace}
+\usepackage{graphicx} 
+\usepackage{forest} 
+\usepackage{tikz-qtree} \usepackage[siunitx, european, straightvoltages, cute inductors]{circuitikz} 
+\usepackage{setspace} \usepackage{ragged2e}
+
+\addbibresource{ref.bib}
+
+\definecolor{codegreen}{rgb}{0,0.6,0} 
+\definecolor{codegray}{rgb}{0.5,0.5,0.5}
+\definecolor{codepurple}{rgb}{0.58,0,0.82} 
+\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
+
+\lstdefinestyle{mystyle}{
+	backgroundcolor=\color{backcolour}, 
+	commentstyle=\color{codegreen}, 
+	keywordstyle=\color{magenta},
+	numberstyle=\tiny\color{codegray}, 
+	stringstyle=\color{codepurple}, 
+	basicstyle=\ttfamily\footnotesize,
+	breakatwhitespace=false, breaklines=true, captionpos=b, keepspaces=true, numbers=left, numbersep=5pt,
+	showspaces=false, showstringspaces=false, showtabs=false, tabsize=8
+}
+\lstset{style=mystyle}
+
+\tikzstyle{startstop} = [rectangle, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30]
+\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=0cm, minimum height=1cm, text centered, draw=black, fill=blue!30]
+\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=orange!30]
+\tikzstyle{subroutine} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=yellow!30, double distance=1]
+\tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
+\tikzstyle{arrow} = [thick,->,>=stealth]
 
 
-\titleformat{\section}
-{\Huge}
-{}
-{0em}
-{}[\titlerule]
+\titleformat{\section} {\Huge} {} {0em} {}[\titlerule] 
 \geometry{a4paper,total={170mm,257mm},left=25mm,right=25mm,}
 
-\author{Lucas Standen}
+\author{Lucas Standen} 
 \title{Creating a simple temprature sensing circuit}
 
-
-
-\begin{document}
+\begin{document} 
 \maketitle
 
 \newpage
-
-\tableofcontents
+\tableofcontents 
 \newpage
 
 \setlength{\parskip}{1em}
 
 {\setlength{\parindent}{0cm}
-
-\section{System Planning}
-\subsection{Problem analysis}
-My circuit will sense temperature, and will be taking into consideration pet owners, worried about 
-their homes over-heating for their pets, this will be especially helpful for owners of sensitive pets 
-such as fish. People who own these pets often leave them at home alone, which can be deadly on summer 
-days, my device plans to alert the owner, and can be attached to other systems such as a cooling system. 
-
-My system, will flash an LED and pulse a buzzer to make it clear that it is too hot, have an indicator 
-to tell the user that something has gone wrong, and have a pin to free to attach to an external system.
-It will have a adjustment dial to change the threshold, so the user can specify what temperature is too
-hot.
-
-\subsection{Who is it for?}
-\subsection{Design specification}
-
-\section{System Design}
-\subsection{Showing how it will function}
-\subsection{The code}
-
-\section{System Realisation}
-\subsection{Ciruit realisation}
-\subsection{Calibrating the sensors}
-\subsection{Results}
-
-\section{System Evaluation}
-\subsection{Did it work?}
-\subsection{What could go better?}
-}
+	\section{System Planning} 
+	\subsection{Problem analysis} 
+	My circuit will sense temperature, and will be taking into consideration pet owners, worried about their homes over-heating 
+	for their pets, this will be especially helpful for owners of sensitive pets such as fish. People who own these pets often 
+	leave them at home alone, which can be deadly on summer days, my device plans to alert the owner, and can be attached to other 
+	systems such as a cooling system.
+
+	My system, will flash an LED and pulse a buzzer to make it clear that it is too hot, have an indicator to tell
+	the user that something has gone wrong, and have a pin to free to attach to an external system.  It will have a
+	adjustment dial to change the threshold, so the user can specify what temperature is too hot.
+
+	\subsection{Who is it for?} 
+	My project will be used by pet owners, focussing on fish, to keep the tank at the
+	correct temperature.  This is a broad range of people as many people own fish\cite{FISH}. Many fish die due to
+	their tanks getting too hot, especially in the summer, my project is perfect for these fish owners.
+
+	\section{Design specification} 
+	\subsection{System Design} 
+	The project will need to do the following things:
+	\begin{description}
+		\item[] Read the temprature
+		\item[] Compare the temprature to a known value
+		\item[] The output is a flashing led and buzzer
+		\item[] The output is a flashing led and buzzer
+	\end{description}
+
+	My system will contain the following components to
+	function: 
+	\begin{description}
+		\item[Mircocontroller] This will be used to control all the other components \item[Thermistor] This will
+			sense the temperature 
+		\item[Potentiomiter] This will set the activation threshold 
+		\item[Red, Green and Amber LED's] These will indicate the state of the device 
+		\item[Buzzer] This will indicate that it is too
+			hot 
+		\item[Button] This will reset the device
+	\end{description} 
+	With these components I will make a circuit that can be used to sense and warn a user about
+	high temperatures. The design will revolve around the micro controller, with everything else coming off it as a
+	sub system like so:
+
+	\begin{center} 
+		\begin{tikzpicture} 
+			\tikzset{edge from parent/.style={draw,edge from parent path={(\tikzparentnode.south)-- +(0,-8pt)-| (\tikzchildnode)}}} 
+			\Tree
+			[.Button
+			[.Microcontroller
+			[.Inputs
+			[.Thermistor ] [.Potentiomiter ]
+			] [.Outputs
+			[.LED(green) ] [.LED(red) ] [.LED(amber) ] [.Buzzer ]
+			]
+			]
+			]
+		\end{tikzpicture} 
+	\end{center}
+
+	As one can see a button will control the Microcontroller, by drawing all the current that the power supply
+	can through the button, one can make the Microcontroller reset. The Microcontroller will have 2 inputs, and
+	4 outputs. The potentiomiter will be used to set the threshold in which the warnings begin, this will be done
+	inside the microcontroller, with a subtraction between the Thermistor value, and the potentiometer value. The
+	needed outputs will pulse to be especially clear that something is wrong.
+
+	\subsection{Flowchart}
+	Here is my code, build into an abstracted flow chart, to make the reading of the program easier. 
+	It is spread across 2 pages, to ensure it is big enough to read.
+
+	\begin{tikzpicture}[node distance=2cm]
+		\node (start) [startstop] {Start};
+		\node (in1) [io, below of=start] {Read temprature};
+		\node (in2) [io, below of=in1] {Read threshold value};
+		\node (dec1) [decision, below of=in2, yshift=-2cm] {Is the temprature too hot?};
+		\node (sub1) [subroutine, right of=dec1, xshift=6cm] {Flash};
+		\node (proc1) [process, below of=dec1, yshift=-2cm, xshift=6cm] {Reset the status flag};
+
+
+		\draw [arrow] (start) -- (in1);
+		\draw [arrow] (in1) -- (in2);
+		\draw [arrow] (in2) -- (dec1);
+		\draw [arrow] (dec1) -- node[anchor=north] {Yes} (sub1);
+		\draw [arrow] (sub1) |- (start);
+		\draw [arrow] (dec1) |- node[anchor=east] {No} (proc1); 
+		\draw [arrow] (proc1) |- (start);
+	\end{tikzpicture}
+	\newpage
+	\begin{tikzpicture}[node distance=2cm]
+		\node (flash) [subroutine, below of=dec1, yshift=-4cm] {Flash};
+		\node (proc2) [process, below of=flash] {Set counter to 5};
+		\node (out1) [io, below of=proc2] {Set LED and buzzer on};
+		\node (proc3) [process, below of=out1] {Wait 1 second};
+		\node (proc4) [process, below of=proc3] {Decrement 1 from the counter};
+		\node (dec2) [decision, below of=proc4, yshift=-1cm] {Is counter == 0};
+		\node (out3) [io, below of=dec2, yshift=-1cm] {Set LED and buzzer off};
+		\node (return) [subroutine, below of=out3] {Return};
+		\node (out2) [io, right of=dec2, xshift=6cm] {Set LED and buzzer off};
+		\node (proc5) [process, above of=out2] {Wait 1 second};
+
+		\draw [arrow] (flash) -- (proc2);
+		\draw [arrow] (proc2) -- (out1);
+		\draw [arrow] (out1) -- (proc3);
+		\draw [arrow] (proc3) -- (proc4);
+		\draw [arrow] (proc4) -- (dec2);
+		\draw [arrow] (dec2) -- node[anchor=north] {No} (out2);
+		\draw [arrow] (dec2) -- node[anchor=east] {Yes} (out3);
+		\draw [arrow] (out3) -- (return);
+		\draw [arrow] (out2) -- (proc5);
+		\draw [arrow] (proc5) |- (out1);
+	\end{tikzpicture}
+
+
+
+	\subsection{How will it function?} 
+	Bellow is the diagram for my circuit, it works mostly via the code on the
+	micro controller, so this is just connecting things between live and the microcontroller.   
+	\begin{flushleft}
+		\begin{circuitikz}
+			\draw (-8,5) to[short,o-o] (8,5){}; % power rail 
+			\draw (0,5) node[vcc]{5V};
+
+			\draw (-8,-6) to[short,o-o] (8,-6){}; % ground rail 
+			\draw (0,-6) node[ground]{};
+
+			\draw (0,3) to[short,o-] (7,3){}; % push button 
+			\draw (7,3) to[push button,-o] (7,-6){};
+
+			\ctikzset{multipoles/thickness=4} 
+			\ctikzset{multipoles/external pins thickness=2} 
+			\draw (0,0)node[dipchip,
+				num pins=18, external pins width=0.3, 
+				external pad fraction=3, 
+				scale=1.8, 
+				rotate=90](Micro){
+				\rotatebox{-90}{PICAXE 18m2}}; % micro controller
+
+			\draw (-7, 5) to[thermistor,a=\tiny{100K},o-o] (-7,0){}; % thermistor 
+			\draw (-7, 0) to[resistor,a=\tiny{100K},o-o] (-7,-6){}; % thermistor divider resistor
+
+			\draw (-7, 0) to[short, o-] (-6,0){}; %thermistor divider wire 
+			\draw (-6, 0) to[short, -] (-6,3){}; 
+			\draw(-6, 3) to[short, -] (-4, 3){}; 
+			\draw (-4, 3) to[short, -] (Micro.pin 18){};
+
+			\draw (-8, 5) to[potentiometer, a=\tiny{10K}, -] (-8, -2){}; 
+			\draw (-8, -2) to[short, -] (-8, -6){};
+
+			\draw (-7.5, 1.5) to[short, o-] (-5, 1.5){}; % potentiometer wire 
+			\draw (-5, 1.5) to[short,-] (-5, 4){};
+			\draw (-5, 4) to[short,-] (-3, 4){}; 
+			\draw (-3, 4) to[short, -] (Micro.pin 17){};
+
+
+			\draw (Micro.pin 14) to[short,-o] (0,5){}; %microcontroller live 
+			\draw (Micro.pin 5) to[short,-o](0,-6){}; %microcontroller ground
+
+			\draw (Micro.pin 6) to[empty led] (1, -4){}; %output red 
+			\draw (Micro.pin 7) to[buzzer] (2, -6){}; %output buzzer 
+			\draw (Micro.pin 8) to[empty led] (3, -4){}; %output amber 
+			\draw (Micro.pin 9) to[empty led] (4, -4){}; %output green
+
+			\draw (1,-4) to[resistor,-o,a=\tiny{220}] (1,-6){}; % output resistor 
+			\draw (3,-4) to[resistor,-o,a=\tiny{220}] (3,-6){}; % output resistor 
+			\draw (4,-4) to[resistor,-o,a=\tiny{220}] (4,-6){}; % output resistor
+		\end{circuitikz} 
+	\end{flushleft} 
+	The way this works is the potential divider on the
+	left feeds into the micro controller which performs a comparison between it and the potentiometer, using the ADC
+	pins on the pic chip. The button seen on the right is being used as a reset switch, for a short time, it can
+	cut short circuit the system, cutting power to the microcontroller, effectively acting as a reset switch. The
+	outputs at the bottom are in order; a red LED that flashes when the circuit detects it is too hot; a buzzer that
+	flashes at the same time; an amber LED that turns on after the flashing has stopped to inform the user that it
+	was too hot at some point; and a green status LED to inform the user that all is working.  
+
+	\subsection{The code}
+	Bellow is the code for the micro controller. It is 59 lines long and commented. It contains 12 unique instructions.
+	\lstinputlisting[]{./final.asm} 
+	This code starts with an initialisation section, that sets the micro controller's input and output pins to do
+	the correct things. Then it defines a subroutine that flashes the LED and buzzer and sets the status led. And
+	finally the main function runs in a loop to continue checking if it is too hot. 
+	\section{System Realisation} 
+	\subsection{Circuit realisation}
+	PUT CIRCUIT PHOTO HERE
+
+	Here is my finished design prototyped on a bread board, I have cut the wires to an adequate length to ensure it is cleanly made.
+	I left the potential divider open, as I changed what value components I was using many times.
+
+	\subsection{Calibrating the sensors} 
+	\subsection{Results}
+
+	\section{System Evaluation} 
+	\subsection{Did it work?} 
+	\subsection{What could go better?}
+
+	\newpage
+
+	\printbibliography 
+} 
 \end{document}