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