Transcript presentation

ECE 445 SENIOR DESIGN
PROJECT 25
SPRING 2012
Otter
Stalker
System
Hui Lin Ng
Yon Chiet Ng
Yong Siang Pay
INTRODUCTION
 in
collaboration with Illinois Natural History
Survey in the study of the river otters
 to
enhance the current technology in
monitoring the habitat of otters
Camera used currently…
Interval for each
video recording:
10sec
Range of
camera view: 60°
Range of
sensor
coverage:
30°
Maximum
length of each
video: 90sec
Current Placement of Cameras…
Camera
with one
sensor
Area
covered
by
sensors
3m
Area
covered
by
cameras
Camera
with one
sensor
3m
OBJECTIVES
 to
improve the sensitivity of
detecting the presence of otters
 to
maximize the sensor and camera
coverage
SYSTEM OVERVIEW
 Consists
 Sensing
of 4 sensors and 2 cameras
network and cameras are
connected wirelessly
Installation of
four external
sensors
FEATURES AND BENEFITS
 Full
monitoring coverage of 3m x
3m area of interest
 Integrating two cameras with one
sensing network wirelessly
 Lasts at least four days
 Inconspicuous habitat-monitoring
infrastructure
 Weatherproof and “chewproof”
BLOCK DIAGRAM
SENSING MODULE


To detect the presence of otter
Consists of four Panasonic NaPiOn Spot Type PIR sensors
OUTPUT OF THE SENSOR:
PCB design for sensor with
sensing range of 38°
PCB design for sensor with
sensing range of 22°
SCHEMATIC OF SENSING MODULE:
3.3V
a
b
c
d
PLACEMENT OF SENSORS:
TESTING AND RESULTS:
False Alarm Miss
Test
Test
Indoor
Temp: 20°C
Wind: -
0.55%
2.17%
0.00%
7.84%
Humidity: 44%
Outdoor
Temp: 17°C
Wind: SSW 19kph
Humidity: 53%
Wireless Communication
Module
 Components
 1x
Linx TXM-418-LC
 2x Linx RXM-418-LC
 1x 8bits CIP-8E encoder
 2x 8bits CIP-8D
decoder
 1x MSP430G2
 1x whip antenna
Schematic – Transmitter
Interface
50Ω
10uF
0.1uF
390Ω
encoder
0.1uF
Hamming Code Implementation
using a single MSP430
Micrcocontroller
Schematic – Receiver
Interface
50Ω
0.1uF
10uF
Decoder
Results
 Input
Signal:
3V pk-pk square wave,
1kHz frequency, 50% duty
cycle
 Output Signal:
3.3V pk-pk square wave,
1kHz frequency, 50% duty
cycle
 Delay: 38us
Results
Duty Cycle: 20%
Duty Cycle: 80%
Conclusion: Delay increases when duty cycle increases.
(80% Duty Cycle @ delay 54us)
Signal To Noise Ratio
Main Controller
 Brain
of the Otter Stalker System
Functions:
 Control the activation of video recording
for Camera Module based on information
from Sensing Module
Main Controller
To
accomplish its task, it will
perform the following subfunctions:
1.
Hamming Code Checking and
Correction
2.
Sensor Interpretation
Main Controller
 Texas
Instrument MSP430G2553
 Reason



of Choice:
Able to perform the functions
specified
Low Power Consumption MCU
Affordable and Comes with a
development kit tool
Main Controller
 Schematic:
Main Controller
 Testing
& Results:
 Hamming
Test
Code Test Results
Input Data with
No Error Test
No correction is
performed
Input Data with
1-Bit Error Test
1-Bit Error is
Corrected
Main Controller
Sensors’ Output
LED Status
Only Sensor “a” is high
The red LED (P1.0) blink and
the green LED(P1.6) did not
blink
The red LED (P1.0) did not
blinks and the green
LED(P1.6) blink
The red LED (P1.0) blink.
After 10 seconds, the green
LED (P1.6) blink

Sensor Interpretations Test
Only Sensor “d” is high
Either Sensor “b” or “c” is
high
Camera Module
Records
a 90 seconds video when
activated by trigger pulse from main
controller
Stores
card
recorded video into memory
Camera Module
 SpyPoint
Pro-X Plus trail cameras
 NMOSFET (FDV301N) as interface
between the Main Controller and
Camera
 Reason



of Choice:
Weatherproof and Chew-proof
60° Camera View
High IR LED illumination
Camera Module
 Schematic:
Camera Module
 MOSFET

Interface Test Result:
The 3V trigger pulse of width 0.8s from main
controller activate camera’s video
recording
Power Supply Module
Components
 4x Energizer Max
Alkaline C-Batteries
 3.3V Voltage
Regulator, LD1117V33
 10uF and 1uF
Capacitors ; 50 Ohm
Resistor
Schematic
10μF
Power Noise
 Transmitter
requires
power noise less than
20mV pk-pk
 Capacitors are added
to reduced voltage
swing
 Voltage swing of 10mV
pk-pk is achieved
Only the front tips of
sensors are exposed
outside the case.
Waterproof silicone glue is
applied.
Include power supply
unit, encoder and
transmitter
Case
Monopod for
adjustable
height
Include Power Supply Unit,
decoder, receiver and
microcontroller
Case
The box inside view
Rubber on the box
edge to make it
waterproof
Challenges & Solutions
Challenges
 Rotating camera makes
too much noise
Solutions
 Add a second camera to
increase the area of view

10seconds cool down
period between each
video recording

Second camera turns on
after 10s delay of the first
one

Lack of testing
equipment for outdoor
testing

Use of MyDAQ to check
the system efficiency

Use of Hamming code to
eliminate and correct
errors

Possible signal
transmission errors
Successes
 Sensing

The maximum allowed angle deviation of
the sensor network from original position is
20° - 25°
 Wireless

Module
Communication Module
The maximum range of operation is about
17.3m.
Recommendations for Future
Works
Improve
audio capability of the
system
Wireless Microphone
Battery
Power Indicator
CREDITS
 Professor
P. Scott Carney
 TA Justine Fortier
 ECE Electronic Shop
 ECE Machine Shop
 Dr. Serge Minin
 Samantha and Team (Illinois Natural
History Survey)
QUESTIONS?