Transcript MDR Presentation

Midway Design Review
Multispectral Camera System
Advisor: Prof. Mario Parente
Team Parente #13
Simon Belkin
Audrey C. Finken
Matthew Walczak
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Presentation Overview
 PDR Feedback
 Refined Application
 Constructing Camera System
 Testing Components
 Budget
 Updated Timeline
 Demo
 Deliverables for CDR
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PDR Feedback
 Get a precision enclosure for camera
system.
 Determine an application for our
camera system.
 Check the web for connections of
camera to the filter wheel assembly.
 Get into the lab.
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PDR Feedback - solutions
 An enclosure system was not needed. CMount adapters provided a completely
enclosed optical path.
 Refined application of camera system:
Agriculture imaging.
 Utilized internet research in all aspects of
multispectral camera design.
 Utilized lab space for system integration.
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Refined Application – Potential Uses
 Determine crop conditions.
 Visualize stress & yield improvement.
 Grain evaluation & sorting.
 Evaluate forest canopy and soil conditions.
 Vegetation and vineyard analysis.
 Weed infestation & disease detection.
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Building the System – Camera
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Building the System – Camera Issue
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Building the System – Ray Tracing
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Camera & Lens Demo
Camera System with
Resistor in Position
to Image
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Resistor Image Captured;
Notice Extreme
Magnification
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Camera & Lens Demo
Tip of a Small Screwdriver
Showing Magnification
Our Lens and Tube
System. Tubes Lead
to Magnification
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Filter Wheel
 We did testing on the filters provided to us.
Through the use of a spectrometer, dark room,
and a white light source, we were able to identify
the different wavelength spectrums of these
filters.
 The graphs produced by the spectroscopic
software shows the wavelength ranges of the
filters.
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Filters
Filter wavelength: 440455nm
Filter wavelength: 505525nm
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Filters Cont.
Filter wavelength:
Clear filter
Filter wavelength: 420440nm
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Building the System – Stepper Motor
 Our stepper motor consists of a 2 stationary coils and
these are turned on and pull a rotary magnet towards
the coil. This action turns a shaft.
 But you must turn the coils on
and off at the right moment to
create rotary movement. This
requires an external circuit
consisting of pulses and these
pulses must contain voltage
and current to deliver energy to
the stepper motor.
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Test and Evaluation
Stepper Motor
Hall Effect
Sensor
(not in used)
Pin-Out
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Basic Test for Stepper Motor
 This was a basic test to
check that the Stepper
motor work. By turning the
motor manually we provided
feedback voltage which lit
the LEDs.
 Similarly we used a Back
EMF test in which you short
two leads together and if the
motor was difficult to move
the connections were from
the same phase.
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Issues with Filter/Stepper Motor
 The main issue with the Filter wheel
was the stepper motor.
 We tried using different ways to excite
the stepper motor to get it to turn
however, we were unsuccessful.
 We have prove through different
methods the pin out and that the
stepper motor is functional.
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Additional Testing
 As an alternate we tried using a
Arduino for testing purposes. Having
found possible set ups for a 4 wire
stepper motor we tried basic code that
would excite one pin at a time while
setting the other to low to test our
stepper motor.
 This however also proved inconclusive.
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Using Various Arduino Code to Test
 As an alternate we also tried using an
L298 as recommended by some sources
we found. This device would act as HBridge (a circuit that enables a voltage to
be a applied across a load in either
direction). Similarly without result.
 Another group also recommended using a
ULN2803A Darlington Array (which takes
current amplified by the first transistor is
amplified further by the second one) with
a basic Arduino code. Similarly with out
results.
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Building the System – Raspberry Pi
 Credit size Linux machine
 SD card for storage
 Ethernet Port
 General Programming
Input Output
− To control stepper motor
 Low cost
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Control of the Stepper motor using RPi
 Coding on RPi
− python
 Use of a stepper driver
− EasyDriver stepper from SparkFun
− to prevent damage to filter wheel due to
high current supplied from the RPi.
− Allow an easier control of stepping
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5V
Image of connections
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Issues with Microcontroller
 RPi
− Arrival of stepper driver caused delay
− Misconnection of RPi
 Switched to Arduino board
− Stepper motor didn’t turn
− Couldn’t pinpoint source of error
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Building the System – Issues found
 Requested parts had been delayed in the
ordering process. (Set us back in time).
 Optical path needed more components to
correct an issue. (Set us back in time and
money).
 Connections – can’t connect to monitors in SDP
lab
 Filter wheel and stepper motor driver issue.
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Analysis of Project progress
 Have all the components for the optics.
Integrate system is in progress.
 Control of the filter wheel turning with
and without Rpi
 Camera is able to work on the RPi
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MDR goals
 Control of filter wheel motor
 Integrate the system
− In progress just missing an equipment
 Camera able to take pictures
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Budget
Unit Cost
Shipping
Cost
Date
Ordered
Date
Received
Ordered From
P/N
Mightex USB
Camera
$219.00
$17.00
7-Nov-12
13-Nov12
Mightex.com
SCEBG04-U
Pentax Lens
$99.95
$5.15
19-Nov12
26-Nov12
B&H Photo.com
Bi-Concave Lens
$31.20
$21.32
Adaptor - C-Mount
to SM1
Item
PE12518M Originally ordered on Nov 12,
I
2012
3-Dec-12 5-Dec-12
ThorLabs.com
LD2297
$19.75
included 3-Dec-12 5-Dec-12
ThorLabs.com
SM1A9
Lens Tube
$12.59
included 3-Dec-12 5-Dec-12
ThorLabs.com
SM1L05
Stepper Motor
Driver
$14.95
free
Amazon.com
A3967
Adaptor - C-Mount
M/M
$25.00
$4.95
19-Nov12
X
Edmund
Optics.com
NT03-629
TBD
TBD
TBD
TBD
TBD
TBD
Filter Order
Sub Cost $422.44
3-Dec-12 6-Dec-12
Comments
Originally ordered on Nov 19,
2012
$48.42
Total Cost $470.86
Remaining
Available Balance
$29.14
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Filters We Have and Need
 1) 420-440nm {‘filter 6’}
 2) 440-455nm {‘filter 2’}
 3) 510-520nm {‘filter 5’}
 4) 400-650nm {‘IR-Cut filter’}
 5) Need additional in range 450-510nm
 6) Need additional filters in range of
700-1000nm
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Deliverables for CDR
 Have the system built and be able to
take pictures
 We would have a solution to deal with
aberrations
 Full control of stepper motor
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Updated Timeline
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Conclusion
We spent a lot of time researching and
gathering info this semester and we also
encountered difficulties and delays that
prevented us from meeting our MDR
goals. But we have learned from our
experience/mistakes and will be better
prepared next semester and meet our set
goals.
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Thank you for your Time! – Questions?
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