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Team Tesla. Wirelessly Powered Sensor Network. Damian Manda Leo Ascarrunz. Brian Fairburn Sarah McNamara. Review: Project Description. Power Transmitter. Wireless Sensor. Wireless Sensor. Wireless Sensor. Wireless Sensor. Wireless Sensor. Wireless Sensor. Extended. Internet. GUI. - PowerPoint PPT Presentation
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Team Tesla
Damian MandaLeo Ascarrunz
Brian FairburnSarah McNamara
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
Power / Processing Board
Power / Processing Board
Sensor Module
Base StationBase Station
ComputerComputer
Analog & Digital Lines
ANT (2.45 GHz RF)
US
B
Web-based
Interface
Web-based
Interface
REST
Power Transmitter
Power Transmitter
Power Source Selection
Rectenna
Processor Transceiver Sensors
DC-DCConverter
Battery Charging
Dual polarized microstrip patch rectenna 5.8GHz
3.8cm
3.8cm
Antenna power output is dependent on: Incident power density (here in μW/cm2) Load resistance
Optimal load resistance for peak power collection is mostly independent of incident power density
Desired Emulated Resistance: 1.2kΩ – 1.5kΩ Want to be on the right side of the curve
Power Source Selection
Rectenna
Processor Transceiver Sensors
DC-DC Converter
Battery Charging
Operates in pulsed fixed frequency discontinuous conduction mode
Resistance seen by the input varies with the output voltage
Also operates in pulsed fixed frequency discontinuous conduction mode
Requires a floating input voltage source to allow non-inverted output
Choice of parameter settings based on: expected input power level desired emulated resistance
Expected input power: 50 μW – 200 μW Emulated resistance: 1.2kΩ – 1.5kΩ
Output Voltage between 3.3 and 2.6 V Input power independent of output
30ms Active Time150 uf Storage
Power Source Selection
Rectenna
Processor Transceiver Sensors
DC-DCConverter
Battery Charging
Processor is able to switch to the backup battery by outputting the Batt_Backup signal
If battery backup is needed, Batt_Backup is set to high, and the input power source is changed to the backup battery
Using Si151DL Complementary 20-V (D-S) Low-Threshold
MOSFET
Power Source Selection
Rectenna
Processor Transceiver Sensors
DC-DCConverter
Battery Charging
As long as the output voltage from the buck-boost converter is above a set level, we want the battery to be charging
If the converter output drops below that set level, the battery stops charging
Using ISL88001 Ultra Low Power 3 Ld Voltage Supervisors Fixed-voltage options allow precise
monitoring of +1.8V, +2.5V, +3.0V, +3.3V and +5.0V power inputs
160nA supply current
Data Collection & Dissemination
Power / Processor Board
SensorIC
Micro PitchConnector
SensorID
SamtecLSHM–120–01–L–DH–A–S–K–TR
Universal Header ConnectionPin Function
1VDD2Sensor Identification Power3Analog Data 14Sensor Identification Output5Analog Data 26Power Down7Analog Data 38SPI Master Output / I2C SDA9SPI Clk
10SPI Master Input / I2C SCL11Digital Data12GND
Accelerometer CMA3000
Temperature TMP36 LM94022
Humidity Ambient Light Occupancy Pressure Force
Using asynchronous communication mode w/ modules as masters
Connection Configuration[UART]
Data Packet
Antenna Factor ANT-2.4-CHP-T Omni-directional radiation pattern 50Ω impedance – no external matching 0.5dBi Gain
Setup Get Data Process Data Transmit Data Sleep
Lock all Unused Pins Set to Input with pull down/up Resistor active
Set on Used Pins Built in UART enabled
9600 baud Built in A/D enabled Watchdog and Interrupts configured Set voltage supervisor trip point
Temperature and Accelerometer
Both are analog devices Use the Built in 12 bit
A/D convertor. Sample and Hold Possible use of the on
board DMA controller to transfer data
Determine if data is needed to be sent. New? Important?
Format Data into a useful format to send. Inputs: Data from A/D Outputs: Data sent to Transmitter
Use Built in UART to communicate with our transceiver.
Asynchronous communication at currently 9600 Baud
Input: Data from Process Data
Output: UART communication
Low Power Mode 3 CPU Disabled MCLK/SMCLK Disabled DCO's dc generator Disabled ACLK still active
Interrupt to deal with data. DMA
GUI Programmed in C# Native USB Libraries Easy to display output Knowledge of developer
Web interface Communication to a REST PHP based server Output to flash charts / PHP dynamic pages
Part Function
LTC6909 High frequency oscillator
LMC7215IM5X Low Frequency Oscillator
Si1488DH MOSFET N-CH 20V 6.1A
BAT43WS Schottky Diode
DS1608C Series(220uH)
Series Shielded Surface Mount Power Inductor
293D 330uF Tantalum Capacitor
Si1501DL Complementary 20-V (D-S) Low-Threshold MOSFET
ISL88001 3 Ld Voltage Supervisors
MSP430F2616 Processor
nRF24AP2 Nordic transceiver
ANT-2.4-CHP-T Data transmission chip antenna
Part Function
CMA3000 Accelerometer
TMP36 Temperature Sensor
LM94022 Temperature Sensor
ORIGINAL
Sensor testing boards
Initial antenna design
First power supply boards done & testing begun
Development board learning
PROGRESS
Circuit diagrams complete
Revision in development by grad students
PCB created, but have since revised converter design
Various sample code run, basic setup code created
Milestone 1 Sensor boards physically constructed Final antenna design Power supply optimization
Milestone 2 Full sensor reading & data transmission Full PCB w/ all parts integrated Computer interface developed
Expo Documentation Final board revisions
Boost Converter Needs 2.2V to start switching Can use S-882Z charge pump to pre-charge
output capacitor to 2.2V Use a battery as storage element
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
Team Tesla
In order of presentation:Sarah McNamaraLeo AscarrunzDamian MandaBrian Fairburn