Introduction
Engineering documents require precise technical notation, diagrams, and specialized formatting. LaTeX provides comprehensive tools for engineering publications.
This guide covers engineering document creation in LaTeX.
Circuit Diagrams
TikZ Circuits
\usepackage{tikz}
\usetikzlibrary{circuits.ee.IEC}
\begin{tikzpicture}[circuit ee IEC]
\draw (0,0) to [resistor={info=$R_1$}] (2,0)
to [capacitor={info=$C_1$}] (4,0);
\draw (2,0) to [voltage source={info=$V_{in}$}] (2,-2);
\end{tikzpicture}
Circuitikz
\usepackage{circuitikz}
\begin{circuitikz}
\draw (0,0) to[R=$R_1$, o-] (2,0)
to[C=$C_1$, -o] (4,0);
\end{circuitikz}
Technical Drawings
Dimension Lines
\usepackage{tikz}
\usetikzlibrary{calc}
\draw (0,0) -- (5,0);
\draw (0,-0.2) -- (0,0.2);
\draw (5,-0.2) -- (5,0.2);
\node at (2.5,0.5) {$L = \SI{5}{\meter}$};
Engineering Reports
Report Template
\documentclass[12pt]{report}
\title{Engineering Design Report}
\subtitle{Project Title}
\author{Engineer Name}
\begin{document}
\chapter{Introduction}
\chapter{Design Analysis}
\chapter{Results}
\chapter{Conclusion}
\end{document}
SI Units and Engineering Notation
Engineering documents require consistent units. The siunitx package provides comprehensive SI unit formatting:
\usepackage{siunitx}
\sisetup{
separate-uncertainty=true,
per-mode=symbol,
exponent-product=\cdot,
output-decimal-marker={.}
}
% Usage examples
\SI{5}{\kilo\gram} % 5 kg
\SI{9.81}{\meter\per\second\squared} % 9.81 m/s²
\SI{100}{\mega\hertz} % 100 MHz
\SI{2.5e3}{\newton} % 2500 N
\SI{1.23(5)}{\milli\meter} % 1.23 ± 0.05 mm
For tables with repeated units, use \si in the column header and \num for numeric values to avoid repetition. The range-phrase option formats ranges like \SIrange{10}{100}{\ohm} for resistance specifications.
Equations and Technical Notation
Engineers frequently need multi-line equations with numbered references. LaTeX’s amsmath package handles these cleanly:
\usepackage{amsmath}
\begin{align}
\nabla \times \mathbf{E} &= -\frac{\partial \mathbf{B}}{\partial t} \label{eq:faraday} \\
\nabla \times \mathbf{H} &= \mathbf{J} + \frac{\partial \mathbf{D}}{\partial t} \label{eq:ampere} \\
\nabla \cdot \mathbf{D} &= \rho \label{eq:gauss} \\
\nabla \cdot \mathbf{B} &= 0 \label{eq:gauss-mag}
\end{align}
Maxwell’s equations in \eqref{eq:faraday} through \eqref{eq:gauss-mag} form the foundation of electromagnetic analysis.
For transfer functions and control systems, use \frac with \mathrm for textual subscripts:
\[
H(s) = \frac{K \cdot \omega_n^2}{s^2 + 2\zeta\omega_n s + \omega_n^2}
\]
Cross-Referencing for Technical Specs
Engineering reports reference figures, tables, and sections extensively. LaTeX’s \ref and \autoref provide context-aware references:
\usepackage{hyperref}
% Referencing
Figure~\ref{fig:stress-strain} shows the material behavior.
\autoref{tab:material-properties} lists yield strengths.
Combine with the cleveref package for plural and ranged references like \cref{fig:a,fig:b,fig:c} producing “Figures 1a to 1c” automatically.
Code Listings for Embedded Systems
Engineering documents often include firmware or Verilog code. The minted package provides syntax highlighting:
\usepackage{minted}
\begin{listing}[htbp]
\begin{minted}[frame=single,linenos,fontsize=\small]{c}
void pwm_init(uint32_t frequency) {
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Prescaler = 72;
TIM_TimeBaseStructure.TIM_Period = 1000;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
}
\end{minted}
\caption{PWM initialization routine for STM32 microcontrollers}
\label{lst:pwm-init}
\end{listing}
Use \ref{lst:pwm-init} to reference the listing from the report body.
Engineering Data Tables
Present test results and material properties in structured tables:
\usepackage{booktabs,siunitx}
\begin{table}[htbp]
\centering
\caption{Tensile Test Results for A36 Steel}
\label{tab:tensile}
\begin{tabular}{lSSS}
\toprule
Specimen & {Yield Strength (MPa)} & {Ultimate (MPa)} & {Elongation (\%)} \\
\midrule
A1 & 262 & 415 & 23 \\
A2 & 258 & 408 & 25 \\
B1 & 271 & 422 & 22 \\
B2 & 265 & 418 & 24 \\
\bottomrule
\end{tabular}
\end{table}
The S column type (from siunitx) aligns numbers on the decimal point and applies unit formatting automatically.
Conclusion
LaTeX creates professional engineering documents with circuit diagrams, technical drawings, and precise notation. Its cross-referencing system, unit formatting, and code listing capabilities make it the standard for engineering publications.
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