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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.

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Team tesla

Team Tesla

Wirelessly Powered Sensor Network

Damian Manda

Leo Ascarrunz

Brian Fairburn

Sarah McNamara

Review project description
Review: Project Description

Power Transmitter

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor

Wireless Sensor




Base Station

System block diagram
System Block Diagram

Sensor Module



Analog & Digital Lines

Power / Processing Board

ANT (2.45 GHz RF)


5.8 GHz RF



Base Station

Power Transmitter

Power system block diagram
Power System Block Diagram

Power Source Selection


Processor Transceiver Sensors



Battery Charging

Power receiving antenna
Power Receiving Antenna

  • Dual polarized microstrip patch rectenna

  • 5.8GHz



Rectenna peak power
Rectenna Peak Power

  • 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

Emulated resistance
Emulated Resistance

  • Desired Emulated Resistance: 1.2kΩ – 1.5kΩ

  • Want to be on the right side of the curve

Power system block diagram1
Power System Block Diagram

Power Source Selection


Processor Transceiver Sensors

DC-DC Converter

Battery Charging

Boost converter
Boost Converter

  • Operates in pulsed fixed frequency discontinuous conduction mode

Boost converter problems
Boost Converter Problems

  • Resistance seen by the input varies with the output voltage

Buck boost converter
Buck-Boost Converter

  • Also operates in pulsed fixed frequency discontinuous conduction mode

  • Requires a floating input voltage source to allow non-inverted output

Buck boost converter2
Buck-Boost Converter

  • 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

Spice simulation results
Spice Simulation Results

  • Output Voltage between 3.3 and 2.6 V

  • Input power independent of output

Spice simulation details
Spice Simulation Details

30ms Active Time

150 uf Storage

Power system block diagram2
Power System Block Diagram

Power Source Selection


Processor Transceiver Sensors



Battery Charging

Power source selection
Power Source Selection

  • 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

Power source selection1
Power Source Selection

  • Using Si151DL

  • Complementary 20-V (D-S) Low-Threshold MOSFET

Power system block diagram3
Power System Block Diagram

Power Source Selection


Processor Transceiver Sensors



Battery Charging

Battery charging
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

Battery charging1
Battery 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

Battery charging system

Power Source Selection

Schematic View

Battery Charging System

Sensors transmission
Sensors & Transmission

Data Collection & Dissemination

Sensor board diagram
Sensor Board Diagram

Universal Header Connection





Micro Pitch




Power / Processor Board

Circuit diagrams sensor board
Circuit Diagrams – Sensor Board

  • Accelerometer

    • CMA3000

  • Temperature

    • TMP36

    • LM94022

  • Humidity

  • Ambient Light

  • Occupancy

  • Pressure

  • Force

Transmission operation
Transmission Operation

Using asynchronous communication mode w/ modules as masters

Connection Configuration


Data Packet

Data transmission antenna
Data Transmission Antenna

  • Antenna Factor ANT-2.4-CHP-T

    • Omni-directional radiation pattern

    • 50Ω impedance – no external matching

    • 0.5dBi Gain

Processor pinout
Processor Pinout



  • 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

Get data
Get Data

  • 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

Process data
Process 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

Transmit data
Transmit Data

  • 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

Computer software
Computer Software

  • 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

Update on cdr goals
Update on CDR Goals



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

  • Sensor testing boards

  • Initial antenna design

  • First power supply boards done & testing begun

  • Development board learning

Forward schedule summary
Forward Schedule Summary

  • 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

Ongoing risks solutions
Ongoing Risks & Solutions

  • 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


Team Tesla

In order of presentation:

Sarah McNamara

Leo Ascarrunz

Damian Manda

Brian Fairburn