Midway Design Review

1Grenzebach Glier & Associates, Inc.

Midway Design Review

Multispectral Camera SystemAdvisor: Prof. Mario Parente

Team Parente #13

Simon BelkinAudrey C. FinkenMatthew 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. C-

Mount 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.4


Refined Application – Potential Uses

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Determine crop conditions. Visualize stress & yield improvement. Grain evaluation & sorting. Evaluate forest canopy and soil conditions. Vegetation and vineyard analysis. Weed infestation & disease detection.


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

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Camera System with Resistor in Position to Image

Resistor Image Captured; Notice Extreme Magnification


Camera & Lens Demo

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Our Lens and Tube System. Tubes Lead to Magnification

Tip of a Small Screwdriver Showing Magnification


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

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Filter wavelength: 440-455nm



Filters Cont.

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Filter wavelength: Clear filter



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.

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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.


Test and Evaluation

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Stepper Motor

Hall Effect Sensor(not in used)

Pin-Out


Basic Test for Stepper Motor

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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.


Issues with Filter/Stepper Motor

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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.


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.18


Using Various Arduino Code to Test

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As an alternate we also tried using an L298 as recommended by some sources we found. This device would act as H-Bridge (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.


Building the System – Raspberry Pi

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Credit size Linux machine SD card for storage Ethernet Port General Programming

Input Output− To control stepper motor

Low cost


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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Image of connections

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5V


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

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Item Unit Cost Shipping

CostDate

OrderedDate

Received Ordered From P/N CommentsMightex USB Camera $219.00 $17.00 7-Nov-12

13-Nov-12 Mightex.com

SCE-BG04-U

Pentax Lens $99.95 $5.1519-Nov-

1226-Nov-

12 B&H Photo.comPE12518M

IOriginally ordered on Nov 12, 2012

Bi-Concave Lens $31.20 $21.32 3-Dec-12 5-Dec-12 ThorLabs.com LD2297 Adaptor - C-Mount to SM1 $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 3-Dec-12 6-Dec-12 Amazon.com A3967

Originally ordered on Nov 19, 2012

Adaptor - C-Mount M/M $25.00 $4.95

19-Nov-12 X

Edmund Optics.com NT03-629

Filter Order TBD TBD TBD TBD TBD TBD

Sub Cost $422.44 $48.42

Total Cost $470.86Remaining

Available Balance $29.14


Filters We Have and Need

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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


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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Midway Design Review

Documents

grenzebach glier associates

system camera issue7

connections of camera

tube system

system integration

camera lens demo10our

clear filter filter

system ray tracing8