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