Date post: | 29-Jan-2016 |
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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