Transcript Wirelessly Powered Sensor Network

Team Tesla
Damian Manda
Leo Ascarrunz
Brian Fairburn
Sarah McNamara
Power
Transmitter
Wireless
Sensor
Wireless
Sensor
Wireless
Sensor
Extended
GUI
Base Station
Internet
Sensor
Module
Webbased
Interface
Analog & Digital Lines
Power /
Processing Board
ANT (2.45 GHz RF)
USB
5.8 GHz RF
REST
Base Station
Power
Transmitter
Computer
Rectenna
DC-DC
Converter
Power Source
Selection
Battery
Charging
Processor
Transceiver
Sensors


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
Rectenna
DC-DC
Converter
Power Source
Selection
Battery
Charging
Processor
Transceiver
Sensors

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 Time
150 uf Storage
Rectenna
DC-DC
Converter
Power Source
Selection
Battery
Charging
Processor
Transceiver
Sensors

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
Rectenna
DC-DC
Converter
Power Source
Selection
Battery
Charging
Processor
Transceiver
Sensors

As long as the output voltage from the buckboost 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
Universal Header Connection
Pin
Sensor
IC
Sensor
ID
Micro Pitch
Connector
Function
1VDD
2Sensor Identification Power
3Analog Data 1
4Sensor Identification Output
5Analog Data 2
6Power Down
7Analog Data 3
8SPI Master Output / I2C SDA
9SPI Clk
10SPI Master Input / I2C SCL
11Digital Data
12GND
Power / Processor Board
Samtec
LSHM–120–01–L–DH–A–S–K–TR

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
MSP430F2616
Pin Type
1VCC
2Analog In
3Analog In
4Analog In
5Analog In
6Analog In
11Vin
20Digital In
21Digital In
22Digital In
29SPI / I2C
30SPI / I2C
31SPI
32UART
33UART
36Digital Out
37Digital Out
38Digital Out
39Digital Out
40Digital Out
41Digital Out
42Digital Out
45SPI / I2C
46SPI / I2C
47SPI
54I/O
55Input
56Input
57Input
58Input
59Analog In
60Analog In
61Analog In
62VSS
63VSS
64VCC
Interface To
Power System
Sensor Board 2
Sensor Board 2
Sensor Board 2
Sensor Boards
Power System
Ground
Nordic nRF24AP2
Sensor Board 1
Sensor Board 2
Sensor Board 1
Sensor Board 1
Sensor Board 1
Nordic nRF24AP2
Nordic nRF24AP2
Sensor Board 1
Sensor Boards
Sensor Board 2
Sensor Boards
Nordic nRF24AP2
Nordic nRF24AP2
Power System
Sensor Board 2
Sensor Board 2
Sensor Board 2
JTAG
JTAG
JTAG
JTAG
JTAG
Sensor Board 1
Sensor Board 1
Sensor Board 1
Ground
Ground
Power System
Interface Type
Digital VCC
Analog Data 1
Analog Data 2
Analog Data 3
Sensor Identification Output
Supervisor Voltage In
Negative Voltage Reference
CTS input
Digital Input
Digital Input
SPI Master Output / I2C SDA
SPI Master Input / I2C SCL
SPI Clk
UART TXD
UART RXD
Power Down
Sensor Identification Power
Power Down
Board ID Input Select
Sleep
¬ Suspend
Battery Select
SPI Master Output / I2C SDA
SPI Master Input / I2C SCL
SPI Clk
TDO (Test Data Output)
TDI (Test Data Input)
TMS (Test Mode Select)
TCK (Test Clock)
Reset
Analog Data 1
Analog Data 2
Analog Data 3
Analog Ground
Digital Ground
Analog VCC





Setup
Get Data
Process Data
Transmit Data
Sleep

Lock all Unused Pins



Set on Used Pins
Built in UART enabled




Set to Input with pull down/up Resistor active
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
PROGRESS

Sensor testing boards

Circuit diagrams complete

Initial antenna design

Revision in development by
grad students

First power supply boards
done & testing begun

PCB created, but have since
revised converter design

Development board
learning

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
Brian
Power
Processor Sensors
management
Data
Xmit
Computer
Systems
X
X
X
X
X
X
X
X
Sarah
X
X
X
X
Leo
X
X
X
X
Damian
X
X
Team Tesla
In order of presentation:
Sarah McNamara
Leo Ascarrunz
Damian Manda
Brian Fairburn