Vigilant Sensing Technology
VST1000 Remote Sensing System
Preliminary Design Review
Development Team: Patrick Hauser
Joel Keesecker
Mark Kien
Review Outline
• Project Objectives
• Motivation
• System & Module Descriptions
• Division of Labor
• Condensed Schedule
• Risks & Mitigation
• Questions
Project/System Objectives
• Seamless turnkey operation
• Broadband pipeline for expandability
• Selection of narrowband sensors
• Clandestine packaging of remote units
Motivations
• Provide generic, economical remote sensing ability for use in public safety and medical environments.
• Use non-dedicated lines to communicate with the sensors in the field.
System Level Diagram
Up
RF Remote Sensing
Unit
Temp
RF Remote Sensing
Unit
Cell Traffic
-
GUI on Host PC
`
Serial Interface
Power Line Remote Sensing
Unit
Cell Traffic
Power Line Remote Sensing
Unit
Temp
Master Controller Unit
RF
Ove
r P
ow
er C
om
mu
nica
tion
Lin
k
2.4 GHz
2.4 GHz
System Modules
• Master Control Unit
• RF Remote Sensing Unit
• Power Line Remote Sensing Unit
• PC Interface
System Interfaces
Outside World Host PC
POWER LINE REMOTE SENSING
UNIT
MASTER CONTROL UNIT
RF REMOTE SENSING UNIT
Keyboard/Mouse/Monitor
RS232/RS485
Power Packet OFDMHomePlug 1.0 Standard
2.4 GHz Wireless
Master Control Unit (MCU)
Master Controller Unit
RF Remote Sensing
Unit
Temp
RF Remote Sensing
Unit
Cell Traffic
-
GUI on Host PC
`
Serial Interface
Power Line Remote Sensing
Unit
Cell Traffic
Power Line Remote Sensing
Unit
Temp
RF
Ove
r P
ow
er
Com
mun
ica
tion
Lin
k
2.4 GHz
RF Transceiver
Microcontroller
Power Line Modem
User Interface
LCD Display? ? ? ?
Power Supply
GPSI
RS233
TBA
2.4 GHz
MCU Basic Functions
• LCD: Sensor data, errors, and status
• Status LEDs: Tx, Rx, Power, Error
• Liaison between Remote Unit and Host PC
• Store data when com link is lost (100 Recs)
• Error monitoring and detection routines
MCU Module Interfaces
LCDDisplay
Power Line Modem
Off the shelfMicrocontroller
2.4 GHz RF Modem
TBA
General Purpose Serial Interface (GPSI) 14Mbs
RS232/RS485
MCU Microcontroller Requirements
• Single Board Microcontroller
• Memory to support the following:– Buffering and storage of sensor data (record
size TBA).– Operating firmware (code size TBA).
• Ports: 1-GPSI, 2-RS232, 16-GPIO
• Speed to support data movement.
MCU Power Line Modem Requirements
• Support serial high speed data – 14Mbps
• Provide P/S for MCU or use single supply
• FCC approved for industrial use
• Small and easy to assimilate into MCU
MCU RF Modem Requirements
• 2.4 GHz FCC Unlicensed Band Operation
• Support serial high speed data – 250Kbps
• Single power supply
• Small and easy to assimilate into MCU
MCU Power Supply Requirements
• Highly efficient design – switching
• Will supply all modules with specific needs
• Strive for single supply solution
• High likelihood for final design group build
Remote Sensor Unit (RSU)
RF Remote Sensing
Unit
Temp
RF Remote Sensing
Unit
Cell Traffic
-
GUI on Host PC
`
Serial Interface
Power Line Remote Sensing
Unit
Cell Traffic
Master Controller Unit
RF
Ove
r P
ower
Co
mm
uni
catio
n Li
nk
2.4 GHz
2.4 GHz
Remote Sensing Unit
RF Transceiver
Microcontroller
Power Line Modem
Status LEDs
Power Supply
GPSI
RS232
GPIO
Sensor
A/D
Lithium Ion Batt
A/D
RSU Basic Functions
• Monitor sensors, send data when critical threshold is reached
• Format and communicate sensor data to MCU• Respond to commands from MCU • Status LEDs: Tx, Rx, Power, Error, Low Battery• Report RSSI to monitor link quality• Custom PCB• Unique ID for each sensor
Sensors
• Original Idea: Radiation Detection• Possible Sensors:
– Temperature– Wireless Signal Detection
• Possibly ADL5500
– Motion– Air Quality (eg. Clean Room)
• Board capable of supporting a variety of sensors
RSU Interfaces
Power Line Modem
Microcontroller
2.4 GHz RF Modem
General Purpose Serial Interface (GPSI) 14Mbs
RS232/RS485
GPIO/ADC
Sensors
Status LEDs
ICSP
Additional I/O for expandability, I2C,
SPI, etc
RSU Microcontroller Requirements
• Same architecture for both boards (TI / Freescale / Atmel)
• Low power consumption• At least 2 channel 8-bit onboard ADC• Onboard UART• Real time clock• Ports: 1 GPSI/RS-232/RS-485, 8-16 GPIO,
ICSP/ISP
RSU Power line Sensor
• GPSI Interface to power line transceiver– Possibly using Asoka PL80-9105-001
• If broadband power line communication proves to difficult fall back to narrowband.
• AC-DC switching power supply
RSU Wireless Sensor
• 2.4 GHz wireless communication– Using Xbee or RS-232 Wireless Modem
• Battery, Charger, and monitor– 9-12 V Lithium-ion Battery– Charger Purchased or own design
• DC-DC switching power supply
• Low standby power consumption
PC InterfaceRF Remote
Sensing Unit
Temp
RF Remote Sensing
Unit
Cell Traffic
-
GUI on Host PC
`Serial Interface
Power Line Remote Sensing
Unit
Cell Traffic
Power Line Remote Sensing
Unit
Temp
Master Controller Unit
RF
Ove
r P
ower
Com
mun
icat
ion
Link
2.4 GHz
2.4 GHz
We don’t want the system to be User Friendly. This way we assure ourselves
job security.
GUI/Host PC Basic Functions
• Interface through RS232 to the MCU
• View historic and “real time” sensor data
• Control data acquisition
• Store data to database
• Monitor sensor status (RSSI, Battery life)
• Error monitoring and detection routines
GUI Data Viewer
• Table of detects
• Detailed info of selected detect
• Detailed info on most recent detect
• Get Detect from wireless device
• Get Detect from power line device
GUI Sensor Information
• Battery power (wireless device)
• Sensor unit RSSI
• Number of sensors on power line unit
• Number of sensors on wireless unit
• ID mapping– ID number and corresponding sensor
Host PC RS232 Communication
• Script to read and write to port– On read, update database
• Communicates with master controller
• Continuous/Scheduled update
• Fetch data upon GUI request
GUI - If Time Permits
• Website– Data viewing only– Way to view data from anywhere
• Historical Info– Plot user defined historical data– Scatter or bar graph depending on data
• Ex. Temperature over time
• Ex. Number of Motion detects/day over 1 week
Division of LaborPat Hauser Joel Keesecker Mark Kien
Primary•GUI Development
•PC Interface
Primary•Remote Unit Circuit & PCB Design
•Research
Primary•H/W Testing
•Sensor Development
•Embedded Software
•Project Manager
•Power Supply Design
Secondary•Embedded Software
•Research
•Testing
Secondary•Embedded Software
•Power Supply Design
•Testing
Secondary•Circuit Design (remote)
All: Documentation
Condensed Schedule
Risks & Mitigation
• Noisy lines could make power line communications difficult– Down grade to narrow band modems or drop Power
Line Modem option altogether.
• Part availability– Address part concerns well in advance of need
• Resources limited– Reduce scope and/or leverage additional dev. tools.
Questions / Suggestions
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