diff options
Diffstat (limited to 'electronics/cw2')
| -rwxr-xr-x | electronics/cw2/build.sh | 3 | ||||
| -rwxr-xr-x | electronics/cw2/cable.sh | 4 | ||||
| -rwxr-xr-x | electronics/cw2/clean.sh | 4 | ||||
| -rw-r--r-- | electronics/cw2/final.asm | 69 | ||||
| -rwxr-xr-x | electronics/cw2/wordcount.sh | 3 | ||||
| -rw-r--r-- | electronics/cw2/writeup.tex | 118 |
6 files changed, 201 insertions, 0 deletions
diff --git a/electronics/cw2/build.sh b/electronics/cw2/build.sh new file mode 100755 index 0000000..bd6f7ab --- /dev/null +++ b/electronics/cw2/build.sh @@ -0,0 +1,3 @@ +#!/bin/bash +pdflatex writeup.tex + diff --git a/electronics/cw2/cable.sh b/electronics/cw2/cable.sh new file mode 100755 index 0000000..f435e0b --- /dev/null +++ b/electronics/cw2/cable.sh @@ -0,0 +1,4 @@ +#!/bin/sh +sudo modprobe ftdi_sio +sudo chmod 777 /sys/bus/usb-serial/drivers/ftdi_sio/new_id +sudo echo "0403 bd90" > /sys/bus/usb-serial/drivers/ftdi_sio/new_id diff --git a/electronics/cw2/clean.sh b/electronics/cw2/clean.sh new file mode 100755 index 0000000..cf008c8 --- /dev/null +++ b/electronics/cw2/clean.sh @@ -0,0 +1,4 @@ +#!/bin/bash +shopt -s extglob + +rm -rf !(*.tex|*.sh|ref.bib|*.asm|images) diff --git a/electronics/cw2/final.asm b/electronics/cw2/final.asm new file mode 100644 index 0000000..fd4ad7d --- /dev/null +++ b/electronics/cw2/final.asm @@ -0,0 +1,69 @@ +init: + clrf PORTA ; make sure port A output latches are low + clrf PORTB ; make sure port B output latches are low + bsf STATUS,RP0 ; select memory bank 1 + movlw b'11111111' ; set port A data direction to inputs + movwf TRISA + movlw b'00000000' ; set port B data direction to outputs + movwf TRISB + bcf STATUS,RP0 ; select memory bank 0 + BACK equ B4 + goto main + +volow: + movlw b'00000001' + movwf PORTB + goto main +vomid: + movlw b'00000011' + movwf PORTB + goto main +vohigh: + movlw b'00000111' + movwf PORTB + goto main +vovhigh: + movlw b'00001111' + movwf PORTB + goto main + + +convert: + andlw b'00001111' + movwf BACK + + andlw b'00001100' + btfsc STATUS, Z + goto volow + movf BACK, W + + andlw b'00001100' + sublw b'00000100' + btfsc STATUS, Z + goto vomid + movf BACK, W + + andlw b'00001100' + sublw b'00001000' + btfsc STATUS, Z + goto vohigh + movf BACK, W + + andlw b'00001100' + sublw b'00001100' + btfsc STATUS, Z + goto vovhigh + movf BACK, W + + goto main +main: + ;goto vovhigh + + call readadc0 + movf B0, W + + goto convert + + goto main + + end diff --git a/electronics/cw2/wordcount.sh b/electronics/cw2/wordcount.sh new file mode 100755 index 0000000..ed898ea --- /dev/null +++ b/electronics/cw2/wordcount.sh @@ -0,0 +1,3 @@ +#!/bin/sh +detex writeup.tex | tail -c +85 | wc -w # using the tail to cut of the stuff detex cant handle + diff --git a/electronics/cw2/writeup.tex b/electronics/cw2/writeup.tex new file mode 100644 index 0000000..1432b3f --- /dev/null +++ b/electronics/cw2/writeup.tex @@ -0,0 +1,118 @@ +\documentclass[a4paper,12pt]{article} + +\usepackage{geometry} +\usepackage{titling} +\usepackage{titlesec} +\usepackage[english]{babel} +\usepackage[hidelinks]{hyperref} +\usepackage{listings} +\usepackage{xcolor} +\usepackage{graphicx} +\usepackage{setspace} +\usepackage{ragged2e} +\usepackage{graphicx} +\graphicspath{ {./images/} } + +\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} + +\titleformat{\section} {\Huge} {} {0em} {}[\titlerule] +\geometry{a4paper,total={170mm,257mm},left=25mm,right=25mm,} + +\author{Lucas Standen} +\title{Creating a simple radio receiver, with a volume intensity meter} + +\begin{document} +\maketitle + +\newpage +\tableofcontents +\newpage + +\setlength{\parskip}{1em} + +{\setlength{\parindent}{0cm} +\section{System planning} + +\subsection{Analysing the problem} +In modern times the need for a radio has obviously fallen, with the rise of TV sets and the internet, generally being a faster method of receiving information, however in some situations, a radio is still preferable. For example if you are hiking, you may be out of range of cellular data, and a TV would require, power and signal which you wont have; in a situation like this a radio is perfect, being a low power device, that can receive important safety information. Similar situations can be drawn for all outdoor use of electronics, weather its a hike, sailing trip, off grid living or something else, a radio can be a valuable tool for keeping up to date on important information. + +I believe creating a simple radio receiver will be helpful to those looking for the capabilities of listening while on the go, it can be small and practical as someone who hikes a lot myself, I would enjoy this project, so I can listen to the news, music or a podcast while hiking, without needing to worry about draining my phones battery, which is better saved for emergency situations. + +\subsection{Design specification} +The product I would like to build for this project is a simple radio receiver, it should receive signals, demodulate them, amplify them and play them out of a speaker. To add something more interesting to my project, I will add a bar graph display that displays the intensity of the currently playing sound. + +The design should focus on simplicity, as less points of failure should result in something reliable. I have in the past, owned a radio for hikes, however it had multiple dials which all clogged with mud, and now it doesn't work; I would much rather have something that is pre tuned to my desired values and left as is. + +\section{System design} + +\subsection{Subsystem designs} +To build my project, I will split it into manageable subsections, that can each be tested and evaluated. The subsystems I intend to build are: +\begin {description} + \item[The receiver:] \hfill \\ + This will be the part of my system that detects the weak incoming radio signals from the outside world weak incoming radio signals from the outside world. + + \item[The initial amplifier:] \hfill \\ + This will boost the small incoming signal to a more reasonable size, to make it easier to process, working with small values may result in signal degradation. + + \item[The demodulation system:] \hfill \\ + This will take the incoming wave, that will be encoded as an AM signal (not FM), and convert it to the audio wave I wish to detect. + + \item[The volume control amplifier:] \hfill \\ + This will be another amplifier that controls the volume of the signal, before it reaches the audio system. + + \item[The audio intensity meter:] \hfill \\ + This will consist of a micro controller (Picaxe 18M2 using the WJEC assembler), and a bar graph, and will show me the current volume of my system. + + \item[The push pull power amplifier:] \hfill \\ + This will boost the power output of my system, allowing it to drive a small speaker (or perhaps headphones), and output the desired audio. + + \item[The speaker:] \hfill \\ + This is the audio output of my system. +\end{description} + +\subsubsection{The receiver} +\subsubsection{etc} +\subsubsection{etc} + +\subsection{Subsystem testing} +\subsubsection{The receiver} +\subsubsection{etc} +\subsubsection{etc} + +\subsection{Subsystem results} +\subsubsection{The receiver} +\subsubsection{etc} +\subsubsection{etc} + +\section{System realisation} +\subsection{Circuit diagram} +\subsection{Circuit realisation} +\subsection{Circuit testing} +\subsection{Circuit results} + +\section{Evaluation} +} +\end{document} |