mirror of
https://github.com/kuhyx/WUT_Computer_Science.git
synced 2026-07-06 10:03:16 +02:00
83 lines
3.5 KiB
TeX
83 lines
3.5 KiB
TeX
\documentclass{article}
|
|
\usepackage{hyperref}
|
|
\usepackage{pdfpages}
|
|
\title{EMISY Project 21 Portable Compass}
|
|
\author{Krzysztof Rudnicki, 307585}
|
|
\date{\today}
|
|
\begin{document}
|
|
\includepdf[pages={1}]{declaration.pdf}
|
|
\maketitle
|
|
\section{Analysis of the project}
|
|
\subsection{Discussion of project requirements}
|
|
We need to create a simple portable compass circuit \\
|
|
It should:
|
|
\begin{itemize}
|
|
\item Use energy-saving power modes of microcontroller
|
|
\item Be battery powered
|
|
\item Be portable (cellphone/wrist watch)
|
|
\item Communicate using graphical OLED display and two buttons keyboard
|
|
\end{itemize}
|
|
\subsection{Discussion of solution}
|
|
\section{Detailed circuit diagram}
|
|
\section{Diagram}
|
|
\subsection{Diagram itself}
|
|
\subsection{Diagram description}
|
|
\subsubsection{How to make the project}
|
|
\newpage
|
|
\subsubsection{Microcontroller}
|
|
I decided to use STM32L082CZ from STM32L0 line
|
|
\paragraph{Relatively small} Up to 10 mm $\times$ 10 mm dimensions,
|
|
compared to apple watch display of 34 mm by 40 mm for smaller version.
|
|
\cite{datasheet}
|
|
111th page
|
|
\paragraph{Square} It is shaped in a square which also simplifies portability
|
|
\cite{datasheet} 111th page
|
|
\paragraph{Power saving} STM32L0 line was designed specifically for low power
|
|
consumption with power consumption as low as 0.29 $\mu$ A in Standby mode
|
|
\cite{datasheet} 1st page
|
|
\paragraph{Consumer devices} This microcontroller comes from STM32LOx2 line
|
|
prepared to be used in consumer devices \cite{consumerDevice}
|
|
\paragraph{Ease of use} USB compatible microcontroller and dedicaded debug port
|
|
allows for swift code creation.
|
|
\cite{datasheet} 1st page
|
|
\subsubsection{All other components}
|
|
\paragraph{Oled display} For OLED display I decided to go with
|
|
NHD-2.7-12864WDY3. It was an OLED display found on \href{www.mouser.pl}{mouser}
|
|
webpage with lowest operating supply current of 180 uA, supply voltage
|
|
compatible wit microcontroller (3.3 V) and datasheet not in japanese.
|
|
\cite{OLED}
|
|
\paragraph{Digital compass} For the compass I used HMC5883L with compatible
|
|
voltage, low power consumption of 100 $\mu$ A, compatiblity with battery powered
|
|
applications according to datasheet and small size
|
|
\paragraph{Battery} For the battery I choose 2x LR44R series battery, with output
|
|
voltage of 1.5 V compatible with voltage regulator (3 V in series), compatible
|
|
battery chemistry of Alkaline, 150 mAh capacity for single battery and compact
|
|
coin cell shape. \cite{Battery}
|
|
\paragraph{Voltage Regulator} For voltage regulator I choose LTC3525-3.3 with high 95 \%
|
|
efficiency, desirable output voltage of 3.3 V, low profile and tiny package, it
|
|
is also available in kicad by default \cite{Voltage Regulator}
|
|
\section{Draft of the microcontroller firmware}
|
|
\subsection{Block diagram}
|
|
\subsection{Description of the algorithm}
|
|
\begin{thebibliography}{9}
|
|
\bibitem{datasheet}
|
|
\href{https://www.st.com/resource/en/datasheet/stm32l082cz.pdf}{STM32LO82CZ
|
|
datasheet}
|
|
\bibitem{consumerDevice}
|
|
\href{https://www.st.com/en/microcontrollers-microprocessors/stm32l0-series.html}{Consumer
|
|
Device STM32LOx2 Line}
|
|
\bibitem{OLED}
|
|
\href{https://www.mouser.pl/datasheet/2/291/NHD_2_7_12864WDY3-1116258.pdf}{OLED
|
|
datasheet}
|
|
\bibitem{Magnetometer}
|
|
\href{https://cdn-shop.adafruit.com/datasheets/HMC5883L_3-Axis_Digital_Compass_IC.pdf}{Magnetometer
|
|
datasheet}
|
|
\bibitem{Battery}
|
|
\href{https://www.murata.com/products/productdata/8809693839390/LR44R-DATASHEET.pdf?1604287808000}{Battery}
|
|
\bibitem{Voltage Regulator}
|
|
\href{https://www.analog.com/media/en/technical-documentation/data-sheets/3525fc.pdf}{Voltage
|
|
regulator}
|
|
\end{thebibliography}
|
|
\end{document}
|
|
|