wireless intelligent sensor modules for home monitoring and control presented by: bui, phuong nhung,...
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Wireless Intelligent Sensor Modules for Home Monitoring and Control
Wireless Intelligent Sensor Modules for Home Monitoring and Control
Presented by:BUI, Phuong Nhung, 裴芳绒
António M. Silva1, Alexandre Correia1, António J. Gano1, António M. de Campos1, Isabel Teixeira,
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ContentsContents
Abstract1
Introduction2
System Description3
Data Communication and System Interfacing 4
5
6
Preliminary Results
Conclusions
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AbstractAbstract
In this paper: wireless intelligent sensor system Bluetooth communications protocol Low cost analog to digital sensor for low-
frequency signals Resistive and capacitive sensor elements Built-in floating-point data processing
functions Digital ASCII string as an output Low-power RISC microcontroller
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Abstract (cont.)Abstract (cont.)
Purpose Home monitoring and control of several physical
variables
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IntroductionIntroduction
Management of physical variables: Important ? Improve
• Domestic comfort
• Security
• Rational use of energy
How the system reach the requirement? Monitor & control some environmental variables
(temperature, humidity, light incidence) Use a network of intelligent sensor modules +
actuators with a set of low frequency variables Wireless Bluetooth protocol
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System DescriptionSystem Description
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System DescriptionSystem Description
Main built-in functions: 2 sensor channels for resistive and/or capacitive
sensors
measure a wide range of low-frequency physical and chemical variables
4 channels for sensors with voltage signals within the range of 0-3V
I2C serial real time clock with calendar
set the acquisition times & other functional time schedules
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System DescriptionSystem Description
Main built-in functions: Internal 256KByte of non-volatile I2C memory
data-logging Sensor circuit interfaces power-saving modes
Set the microcontroller into deep sleep mode
Serial RS232 port Wireless communications module using the serial
profile of the Bluetooth protocol
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Sensor interfacingSensor interfacing
The intelligent sensor module uses a Universal Transducer Interface (UTI) circuit: low-cost and flexible analog to digital
• Directly convert the signal from a sensor element into a digital signal
• With a time domain variation =>Easily code into a digital word
Low-frequency signals• Easily convert signals based on resistor / capacitance
sensor elements
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Sensor interfacingSensor interfacing
Ms: The output of the system to a signal Si. k & Moff : The unknown gain and offset of the global linear measuring system
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Sensor interfacingSensor interfacing
Measure 3 signals:
Compute the ratio
Sref : a known reference sensor or component value
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Sensor interfacingSensor interfacing
Evaluate the procedures: Compensate for any drift of the gain and offset of
the system Make the accuracy of the measurement
dependent on:• the characteristics of the reference component used
• processing errors in the digital domain
low-cost sensor interface that can be successfully used in measuring
low-frequency signals based on resistive orcapacitive sensor elements
low-cost sensor interface that can be successfully used in measuring
low-frequency signals based on resistive orcapacitive sensor elements
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Data ProcessingData Processing
Functionalities: Internal data acquisition & processing
Procedures Local control Digital data management and transmission
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Data ProcessingData Processing
Parameters for programming the overall data acquisition process & transfer functions coefficients Store in local non-volatile memory E2PROM memory
Measure the output periods of the UTI Use the internal 16 bit timers of the
microcontroller Counting sampling period of 1μs
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Data ProcessingData Processing
Two channels: Measure four voltage signals 0 to +3V 10-bit resolution AD converter
internal data processing calculations Floating-point math
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Data ProcessingData Processing
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Data ProcessingData Processing
Thus with clock frequency of 4MHz Acquisition time: 360 ms Polynomial computation time: 3.75 ms Maximum sampling frequency: 1 sample/s Output data: a digital value of the measured
sample with an ASCII representation
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Data CommunicationData Communication
Internal wireless communications module Bluetooth protocol Spread Spectrum by frequency hopping in the
ISM 2.4GHz Band Transmission range: 100 m Data transfer rate: 200Kbps Use AT Command Set for setup and
configurationRS232 connection for data communications
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System InterfaceSystem Interface
Use digital ASCII strings =>ASCII commands System configuration Management Data acquisition
Implement Custom ASCII frame Custom handshake protocol
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System InterfaceSystem Interface
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System InterfaceSystem Interface
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System InterfaceSystem Interface
Graphical user interface Use the Microsoft VisualBasic.NET 2 main option tabs:
• Interface Configuration
• Module Information
Program, control and get sensor data from several associated intelligent sensor modules
Communicate with it• Wireless Bluetooth protocol
• Serial RS232 connection
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Preliminary resultsPreliminary results
Implement a preliminary prototype with two UTI measuring channels
Variable Name Value
Temperature -15ºC to +55ºC
Relative humidity 0-100% RH
Low TCR precision resistance Rref=100 Ω ±0.1%
Ceramic capacitor Cref=100pF ±10%.
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Preliminary resultsPreliminary results
The transfer functions
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Preliminary resultsPreliminary results
The correcting function is given
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Preliminary resultsPreliminary results
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ConclusionsConclusions
Design and implement: A wireless intelligent sensor module
• Wide range of low frequency signals
• Low cost front-end interface for resistive and capacitive sensor elements
• Modular architecture
• Completely programmable using a set of ASCII commands for device configuration and data acquisition
Preliminary result• Measure ambient temperature and relative humidity
• Show promising results
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