Team Tesla

Provide monitoring of employees with cognitive disabilities

Sense changes in position and stress levels Easy to deploy and maintain Non-intrusive devices Report conditions to supervisors

InternetInternet

Extended

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Base StationBase Station

Power Transmitter

Power Transmitter

GUI

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Low User Maintenance Wireless Power Reception 2-3 Meter Functional Range Intelligent Power Management System

Multiple Sensor Capability Wireless Transmission of Sensor Data Graphical Data Display

Small size

Reception & RectificationReception & Rectification Power ManagementPower Management

Pulse GenerationPulse Generation

StorageStorage

MSP430MSP430

ANT TransceiverANT Transceiver

Sensor ArraySensor Array

Amplifier fed by a sweeper Possibly a dedicated oscillator to feed it Transmit at most 1 Watt Continuous and low power - source does not

need controlling

Ambient Power can also be collected

Specific Frequency Receiver Antenna Microstrip patch rectenna

Dual polarized Ground on back, useful for mounting

3.8cm

3.8cm

Maximize power transfer between antenna and storage system

Thin film Batteries

Boost converter Feedback loop to maximize power transfer

Power dependent sleep and wake Modes

1W Transmitter at 2m range, 8dB gain 12uW/cm2 incident power 9cm2 area of receiving antenna 108uW power

Antenna Efficiency minimum at 20% Power System Efficiency of 60% Efficiency of Battery Charging System 90%

This gives us 11.6uW to work with

System Running at 3.3V

Sleep power: 3.63 uW Rest of power available determines transmission

rate

Curr

ent

Time ->

MSP430F26XX Active Mode: 365 uA at 1MHz Standby Mode: .5 uA Off Mode: .1uA for RAM retention A/D for sensors Brownout detector Several Timers Several Low Power Modes

Nordic nRF24AP2 17mA max draw Multiple channels for many sensors 2.4-2.5 GHz ISM band ANT Protocol Up to 1Mbps

PASSIVE SENSORS

Temperature Skin conductivity Pressure

ALERT SENSORS

Shock Accelerometer Panic button

Wake Up

Check Mode

Have Power to Transmit

Panic

Have Power to Transmit

Normal

Set Wake Timer

No Transmit Alert

Confirmation

Yes

Sleep

Sample DataYesNo

Transmit Data

Interface with a USB ANT receiver Ant Protocol

Used in low power personal area networks “Data Processing” Pretty Pictures

RISK

Inexperience with the parts

Power system potentially complicated

Time Module explodes

MITIGATION

Scheduled lots of up front learning/testing time

Have multiple designs with different levels of complexity.

Hopefully stick to our plan Building multiple modules

at once

Web Based GUI Increased Number of Sensors Per Module Sensor Module Network 2 Way Communication Between Module and

Base Station

Parts per 1 board Processor

▪ $5 Sensor

▪ $5 Transceiver

▪ $4 USB Receiver

▪ $35 PCB

▪ $70 Antenna Substrate

▪ $150 Misc

▪ $75 Overestimate

▪ ~$350

Learning Times Processor

▪ 1.5 Weeks Sensor

▪ 3 days Transmitter

▪ 2 days Receiver/GUI

▪ 1.5-2 weeks Antenna

▪ 2 week Power System Options

▪ 2 weeks

Names Power Xmit

Antenna Power management

Processor Sensors Data Xmit

Computer Systems

Brian X X X X X

Sarah X X X X

Leo X X X X

Damian X X X X X

Names (in presentation order): Damian Manda Leo Ascarrunz Brian Fairburn Sarah McNamara