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Started datasheet.

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David Žaitlík 2022-07-25 22:35:06 +02:00
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\documentclass[12pt,oneside,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{fancyhdr}
\usepackage{graphics}
\usepackage{graphicx}
\usepackage{geometry}
\usepackage{multicol}
\usepackage{capt-of}
\usepackage[table]{xcolor}
\usepackage{hyperref} % for internal section links
% ONLY FOR DRAFT
\usepackage{draftwatermark}
\SetWatermarkText{PRELIMINARY}
\SetWatermarkScale{3}
% ONLY FOR TEMPLATE
\usepackage{blindtext}
%
% Sensor name definition
%
\newcommand{\sensor}{RHT01}
\pagestyle{fancy}
\fancyhf{}
%\fancyhead[LE,LO]{\includegraphics[scale=0.075]{./fig/VelesLabsLogo.png}}
%\fancyhead[RE,RO]{\sensor{}\\DATASHEET v. 1.0}
%\fancyfoot[LE,LO]{\leftmark}
%\fancyfoot[RE,RO]{\thepage}
\fancyhead[LO]{\includegraphics[height=1.0cm]{./fig/logo/PNGs/Long_Logo_One_Line_Text/veles_labs_logo_small_letters_transparent_600x185.png}}
\fancyhead[RO]{\sensor{}\\DATASHEET v. 1.0}
\fancyfoot[LO]{\leftmark}
\fancyfoot[RO]{\thepage}
\renewcommand{\headrulewidth}{2pt}
\renewcommand{\footrulewidth}{2pt}
\setlength{\headheight}{35pt}
\begin{document}
% TITLE PAGE
\begin{multicols*}{2}
\begin{center}
\includegraphics[width=0.45\textwidth]{./fig/rht_wired_sensor.jpg}
\end{center}
\section*{Features}
\begin{itemize}
\setlength\itemsep{0cm}
\item Measures all important indoor air quality values: T, RH, light intensity
\item Communicates via Modbus RTU (RS-485)
\item Wide input voltage range 5 - 30V
\item Easy to setup using Raspberry Pi and open-source Veles Sensors python library
\item Temperature range -40 - 125 °C
\item Relative humidity range 0 - 100 \%
\item Light intensity from 0.01 to 64k lux
\item Fully opensource
\end{itemize}
\vfill
\section*{Description}
\sensor{} is a wired indoor air quality sensor measuring temperature, relative humidity and light intensity. Communication over RS-485 using Modbus RTU protocol makes it easy to interface with the sensor using PLC or any PC with RS-485 to USB converter. Open-source Python libraries are available to ease sensor configuration and readout using PC and embedded computers (e.g. Raspberry Pi).\\
\\
A wide input voltage range makes it possible to integrate the sensor with many different systems, ranging from house-wide 12V bus to 5V USB connected to a local computer.\\
\\
Fully open-source ecosystem: sensor hardware, case, firmware, and connected Python libraries are open-sourced under permissive licensing.\\
%\\
%Can be used in many applications such as monitoring of home and office spaces, ventilation control or for smart greenhouse applications.
\end{multicols*}
\vfill
\pagebreak
\tableofcontents
\listoffigures
\listoftables
\pagebreak
\section{Specifications}
\subsection{Electrical Specifications}
\begin{table}[h]
\scriptsize
\begin{tabular}{|p{5cm}|p{2cm}|p{1cm}|p{1cm}|p{1cm}|p{1cm}|}
\hline
\rowcolor{lightgray}\textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} & \textbf{Unit} \\ \hline
Input voltage & $\mathrm{V_{DD}}$ & 5 & 12 & 24 & V \\ \hline
Average supply current & $\mathrm{I_{DD}}$ & & & 50 & mA \\ \hline
RS485 Single-Ended Output High & $\mathrm{V_{OH}}$ & 2.2 & & & V \\ \hline
RS485 Single-Ended Output Low & $\mathrm{V_{OL}}$ & & & 0.8 & V \\ \hline
RS485 Differential Output & $\mathrm{V_{OD}}$ & 2.0 & & & V \\ \hline
RS485 Receiver Differential Threshold Voltage & $\mathrm{V_{TH}}$ & -200 & -105 & -10 & mV \\ \hline
\end{tabular}
\normalsize
\caption{Electrical Specifications}
\label{tab:specifications_electrical}
\end{table}
\vfill
\subsection{Sensing Specifications}
\begin{table}[h]
\scriptsize
\begin{tabular}{|p{5cm}|p{3cm}|p{4.25cm}|}
\hline
\rowcolor{lightgray}\textbf{Parameter} & \textbf{Conditions} & \textbf{Value} \\ \hline
T measurement range & \multicolumn{1}{c|}{-} & –40 $\div$ +125 $^{\circ}$C \\ \hline
T measurement accuracy & Typical & $\pm$0.2 $^{\circ}$C \\ \hline
T measurement repeatability & Typical & $\pm$0.2 $^{\circ}$C \\ \hline
RH measurement range & \multicolumn{1}{c|}{-} & 0 $\div$ 100 \%RH \\ \hline
RH measurement accuracy & Typical & $\pm$1.8 \%RH \\ \hline
RH measurement repeatability & \multicolumn{1}{c|}{-} & $\pm$0.08 \%RH \\ \hline
RH measurement repeatability & ADC Ticks & 0 $\div$ 65535 \\ \hline
\end{tabular}
\normalsize
\caption{Sensing Specifications}
\label{tab:specifications_sensing}
\end{table}
\vfill
\subsection{Interface Specifications}
\begin{table}[h]
\scriptsize
\begin{tabular}{|p{3.75cm}|p{9cm}|}
\hline
\rowcolor{lightgray}\textbf{Parameter} & \textbf{Value} \\ \hline
Used Protocol & Modbus RTU \\ \hline
Default Baudrate & 19200 Baud \\ \hline
Usable Baudrates & 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, 119200 Baud \\ \hline
Data Bytes & 8 \\ \hline
Parity & Even \\ \hline
Stop Bits & 1 \\ \hline
\end{tabular}
\normalsize
\caption{Sensing Specifications}
\label{tab:specifications_interface}
\end{table}
\vfill
\pagebreak
\subsection{Connectors Pinout}
\subsubsection{Main Connector Pinout}
The main connector is the Sullins Connector Solutions SWR204-NRTN-D02-RA-GA connector. The matching connector for the cable is SWH204-NULN-D02-UU-WH with SWT204-UPTN-S01-UU-UU crimping pins.\\
The pinout can be seen in figure \ref{fig:connector_pinout} and table \ref{tab:connector_pinout}.
\begin{figure}[h]
\begin{minipage}[c]{0.5\linewidth}
\centering
\includegraphics[width=0.5\textwidth]{./fig/connector_pins.png}
\caption{Main Connector Pinout}
\label{fig:connector_pinout}
\end{minipage}
\begin{minipage}[c]{0.5\linewidth}
\centering
\scriptsize
\begin{tabular}{|p{0.75cm}|p{1.25cm}|p{3cm}|}
\hline
\rowcolor{lightgray}\textbf{Pin} & \textbf{Name} & \textbf{Description} \\ \hline
1 & VDD & Supply Voltage \\ \hline
2 & A & RS485 A+ \\ \hline
3 & B & RS485 B- \\ \hline
4 & GND & Ground \\ \hline
\end{tabular}
\captionof{table}{Main Connector Pinout}
\label{tab:connector_pinout}
\end{minipage}
\end{figure}
\subsubsection{Programming Connector Pinout}
The sensor can be programmed through the Serial Wire Debug (SWD) interface using an ST-Link. ST-Link can be connected to the sensor using pads for spring-loaded pins in the bottom layer of the PCB.
The pinout can be seen in table \ref{tab:swd_connector_pinout}. The first pin of the connector is marked with a square pad.
\begin{table}[h]
\scriptsize
\centering
\begin{tabular}{|p{0.75cm}|p{1.55cm}|p{3cm}|}
\hline
\rowcolor{lightgray} \textbf{Pin} & \textbf{Name} & \textbf{Description} \\ \hline
1 & 3V3 & 3.3V Sensing \\ \hline
2 & GND & Ground \\ \hline
3 & SWDIO & SWD Data \\ \hline
4 & SWCLK & SWD Clock \\ \hline
5 & NRST & MCU Reset \\ \hline
\end{tabular}
\caption{Programming Connector Pinout}
\label{tab:swd_connector_pinout}
\end{table}
\section{Communication Specification}
For the physical layer, RS-485 is used. This allows the communication to be robust and resistant to EMI (electro-magnetic interference). On top of the physical layer, Modbus RTU is used as a data link layer. This protocol is widely supported by the number of PLCs and other devices. To interface with a PC (or any computer with a USB port), a USB to RS485 converter may be used in conjunction with the Veles Sensors python library.
\subsection{Physical Layer - RS485}
RS-485 is a full-duplex serial bus, ideally suited for low-speed, noise-resistant communication over long distances (up to 1200 m - more if repeaters are used). Linear bus topology is preferable over star or ring configurations. To prevent signal reflections, each sensor is equipped with a 120 $\Omega$ termination resistor. Therefore, the optimal cable for connecting sensors to each other and to the master node is a twisted pair cable with 120 $\Omega$ characteristic impedance.
\subsection{Data Link Layer - Modbus RTU}
Modbus is a well-tested, openly-published, and royalty-free data communications protocol. Developed for industrial applications, it aims to be simple and robust. It is a client/server (master/slave) type protocol. The maximum number of client nodes on a Modbus bus is 247.
A limitation of Modbus-based buses is that there is no arbitration in case of address conflict. This means that nodes should be either added one by one or node addresses should be configured beforehand.
Address 0 can be used as a broadcast message (e.g. instructing all sensors to turn off LED). No slave response is generated.
\subsubsection{Modbus register space}
Modbus supports four types of registers:
\begin{table}[h]
\scriptsize
\centering
\begin{tabular}{|p{3cm}|p{3cm}|p{3cm}|p{3cm}|}
\hline
\rowcolor{lightgray} \textbf{Object type} & \textbf{Access} & \textbf{Size} & \textbf{Address space} \\ \hline
Coil & read / write & 1 bit & 00001 - 09999 \\ \hline
Discrete input & read & 1 bit & 10001 - 19999 \\ \hline
Input register & read & 16 bits & 30001 - 39999 \\ \hline
Holding register & read / write & 16-bits & 40001 - 49999 \\ \hline
\end{tabular}
\caption{Modbus register space}
\label{tab:modbus_register_space}
\end{table}
\vfill
\pagebreak
\subsection{\sensor{} Modbus registers}
\subsubsection{Input registers}
Input registers contain measured values. They are read-only and 16-bit in size.
\begin{table}[h]
\scriptsize
\centering
\begin{tabular}{|p{4cm}|p{2.5cm}|p{2cm}|p{3.6cm}|}
\hline
\rowcolor{lightgray} \textbf{Register name} & \textbf{Register address} & \textbf{Unit} & \textbf{Note} \\ \hline
Serial Number HI & 30001 & - & \\ \hline
Serial Number LO & 30002 & - & \\ \hline
Temperature & 30003 & °C & \\ \hline
Temperature & 30004 & °F & \\ \hline
Relative humidity & 30005 & \% & \\ \hline
$\mathrm{CO_2}$ concentration & 30006 & ppm & \\ \hline
Light Intensity CH0 & 30007 & ticks & \\ \hline
Light Intensity CH1 & 30008 & ticks & \\ \hline
Temperature ERROR & 30009 & - & \\ \hline
Relative Humidity ERROR & 300010 & - & \\ \hline
Light Intensity ERROR & 300011 & - & \\ \hline
\end{tabular}
\caption{Modbus input registers for \sensor{}}
\label{tab:modbus_input_registers}
\end{table}
\subsubsection{Holding registers}
The holding registers can be written to by the master node. Sensor \sensor{} offers the following configuration registers:
\begin{table}[h]
\scriptsize
\centering
\begin{tabular}{|p{4cm}|p{2cm}|p{6.5cm}|}
\hline
\rowcolor{lightgray} \textbf{Register name} & \textbf{Address} & \textbf{Note} \\ \hline
Device Modbus address & 40001 & see \hyperref[holdingReg:note2]{Note 4} \\ \hline
Modbus baudrate & 40002 & see \hyperref[holdingReg:note2]{Note 5} \\ \hline
Light Sensor Gain & 40003 & see \hyperref[holdingReg:note1]{Note 1} \\ \hline
Light Sensor Measurement Rate & 40004 & see \hyperref[holdingReg:note2]{Note 2} \\ \hline
Light Sensor Integration Time & 40005 & see \hyperref[holdingReg:note3]{Note 3} \\ \hline
Reset device & 49999 & see \hyperref[holdingReg:note2]{Note 6} \\ \hline
\end{tabular}
\caption{Modbus holding registers for \sensor{}}
\label{tab:modbus_holding_registers}
\end{table}
\paragraph{Note 1}
\label{holdingReg:note1}
The gain can be set to following values:
\begin{table}[h]
\scriptsize
\centering
\begin{tabular}{|p{4cm}|p{6.5cm}|}
\hline
\rowcolor{lightgray} \textbf{Gain} & \textbf{Value [lux]} \\ \hline
1X & 1 $\div$ 64k \\ \hline
2X & 0.5 $\div$ 32k \\ \hline
4X & 0.25 $\div$ 16k \\ \hline
8X & 0.125 $\div$ 8k \\ \hline
48X & 0.02 $\div$ 1.3k \\ \hline
96X & 0.01 $\div$ 600 \\ \hline
\end{tabular}
\caption{Gain values of LTR-329ALS-01}
\label{tab:ltr_gain}
\end{table}
\paragraph{Note 2}
\label{holdingReg:note2}
The measurement rate can be set to following values: 50, 100, 200, 500, 1000 and 2000 ms. Insert these values as an integer in milliseconds.
\paragraph{Note 3}
\label{holdingReg:note3}
The integration time can be set to following values: 50, 100, 150, 200, 250, 300, 350 and 400 ms. Insert these values as an integer in milliseconds.
\paragraph{Note 4}
\label{holdingReg:note4}
Device Modbus address may be changed by writing to this register. The allowed values are in the range of 1 to 247. The device will start using a new address immediately and cease to respond at the previous address. Reset is not needed. It is the responsibility of the user to prevent address collisions on a bus.
\paragraph{Note 5}
\label{holdingReg:note5}
Modbus baudrate in bits/s. May be one of: 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, 115200. Please be aware that lower baudrates are more reliable for long distance communication.
\paragraph{Note 6}
\label{holdingReg:note6}
Writing the magic constant 0xABCD to this device will instruct the device to soft-reset.
\vfill
\section{Mechanical Dimesions}
\includegraphics[scale=0.75]{./fig/RHT_Sensor_Enclosure-Enclosure_TOP.pdf}
\section{Schematic}
\includegraphics[angle=90,origin=c,scale=0.7]{./../../PCB/Project_Outputs/Schematic/rht_wired_sensor.pdf}
\end{document}

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\babel@toc {english}{}\relax
\contentsline {section}{\numberline {1}Specifications}{3}{section.1}%
\contentsline {subsection}{\numberline {1.1}Electrical Specifications}{3}{subsection.1.1}%
\contentsline {subsection}{\numberline {1.2}Sensing Specifications}{3}{subsection.1.2}%
\contentsline {subsection}{\numberline {1.3}Interface Specifications}{3}{subsection.1.3}%
\contentsline {subsection}{\numberline {1.4}Connectors Pinout}{4}{subsection.1.4}%
\contentsline {subsubsection}{\numberline {1.4.1}Main Connector Pinout}{4}{subsubsection.1.4.1}%
\contentsline {subsubsection}{\numberline {1.4.2}Programming Connector Pinout}{4}{subsubsection.1.4.2}%
\contentsline {section}{\numberline {2}Communication Specification}{4}{section.2}%
\contentsline {subsection}{\numberline {2.1}Physical Layer - RS485}{5}{subsection.2.1}%
\contentsline {subsection}{\numberline {2.2}Data Link Layer - Modbus RTU}{5}{subsection.2.2}%
\contentsline {subsubsection}{\numberline {2.2.1}Modbus register space}{5}{subsubsection.2.2.1}%
\contentsline {subsection}{\numberline {2.3}RHT01{} Modbus registers}{6}{subsection.2.3}%
\contentsline {subsubsection}{\numberline {2.3.1}Input registers}{6}{subsubsection.2.3.1}%
\contentsline {subsubsection}{\numberline {2.3.2}Holding registers}{6}{subsubsection.2.3.2}%
\contentsline {paragraph}{Note 1}{6}{section*.6}%
\contentsline {paragraph}{Note 2}{7}{section*.7}%
\contentsline {paragraph}{Note 3}{7}{section*.8}%
\contentsline {paragraph}{Note 4}{7}{section*.9}%
\contentsline {paragraph}{Note 5}{7}{section*.10}%
\contentsline {paragraph}{Note 6}{7}{section*.11}%
\contentsline {section}{\numberline {3}Mechanical Dimesions}{9}{section.3}%
\contentsline {section}{\numberline {4}Schematic}{11}{section.4}%

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