1 Grenzebach Glier & Associates, Inc. Midway Design Review Multispectral Camera System Advisor: Prof. Mario Parente Team Parente #13 Simon Belkin Audrey C. Finken Matthew Walczak 1

2 Grenzebach Glier & Associates, Inc. Presentation Overview  PDR Feedback  Refined Application  Constructing Camera System  Testing Components  Budget  Updated Timeline  Demo  Deliverables for CDR 2

3 Grenzebach Glier & Associates, Inc. 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. 3

4 Grenzebach Glier & Associates, Inc. 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

5 Grenzebach Glier & Associates, Inc. Refined Application – Potential Uses 5  Determine crop conditions.  Visualize stress & yield improvement.  Grain evaluation & sorting.  Evaluate forest canopy and soil conditions.  Vegetation and vineyard analysis.  Weed infestation & disease detection.

6 Grenzebach Glier & Associates, Inc. Building the System – Camera 6

7 Grenzebach Glier & Associates, Inc. Building the System – Camera Issue 7

8 Grenzebach Glier & Associates, Inc. Building the System – Ray Tracing 8

9 Grenzebach Glier & Associates, Inc. Camera & Lens Demo 9 Camera System with Resistor in Position to Image Resistor Image Captured; Notice Extreme Magnification

10 Grenzebach Glier & Associates, Inc. Camera & Lens Demo 10 Our Lens and Tube System. Tubes Lead to Magnification Tip of a Small Screwdriver Showing Magnification

11 Grenzebach Glier & Associates, Inc. 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. 11

12 Grenzebach Glier & Associates, Inc. Filters 12 Filter wavelength: nm Filter wavelength: nm

13 Grenzebach Glier & Associates, Inc. Filters Cont. 13 Filter wavelength: Clear filter Filter wavelength: nm

14 Grenzebach Glier & Associates, Inc. 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. 14  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.

15 Grenzebach Glier & Associates, Inc. Test and Evaluation 15 Stepper Motor Hall Effect Sensor (not in used) Pin-Out

16 Grenzebach Glier & Associates, Inc. Basic Test for Stepper Motor 16  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.

17 Grenzebach Glier & Associates, Inc. Issues with Filter/Stepper Motor 17  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.

18 Grenzebach Glier & Associates, Inc. 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

19 Grenzebach Glier & Associates, Inc. Using Various Arduino Code to Test 19  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.

20 Grenzebach Glier & Associates, Inc. Building the System – Raspberry Pi 20  Credit size Linux machine  SD card for storage  Ethernet Port  General Programming Input Output − To control stepper motor  Low cost

21 Grenzebach Glier & Associates, Inc. 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 21

22 Grenzebach Glier & Associates, Inc. Image of connections 22 5V

23 Grenzebach Glier & Associates, Inc. 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 23

24 Grenzebach Glier & Associates, Inc. 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. 24

25 Grenzebach Glier & Associates, Inc. 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 25

26 Grenzebach Glier & Associates, Inc. MDR goals  Control of filter wheel motor  Integrate the system − In progress just missing an equipment  Camera able to take pictures 26

27 Grenzebach Glier & Associates, Inc. Budget 27 ItemUnit Cost Shipping Cost Date Ordered Date ReceivedOrdered FromP/NComments Mightex USB Camera$219.00$ Nov Nov- 12Mightex.com SCE- BG04-U Pentax Lens$99.95$ Nov Nov- 12B&H Photo.com PE12518M I Originally ordered on Nov 12, 2012 Bi-Concave Lens$31.20$ Dec-125-Dec-12ThorLabs.comLD2297 Adaptor - C-Mount to SM1$19.75included3-Dec-125-Dec-12ThorLabs.comSM1A9 Lens Tube$12.59included3-Dec-125-Dec-12ThorLabs.comSM1L05 Stepper Motor Driver$14.95free3-Dec-126-Dec-12Amazon.comA3967 Originally ordered on Nov 19, 2012 Adaptor - C-Mount M/M$25.00$ Nov- 12X Edmund Optics.comNT Filter OrderTBD Sub Cost$422.44$48.42 Total Cost$ Remaining Available Balance$29.14

28 Grenzebach Glier & Associates, Inc. Filters We Have and Need 28  1) nm {‘filter 6’}  2) nm {‘filter 2’}  3) nm {‘filter 5’}  4) nm {‘IR-Cut filter’}  5) Need additional in range nm  6) Need additional filters in range of nm

29 Grenzebach Glier & Associates, Inc. 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 29

30 Grenzebach Glier & Associates, Inc. Updated Timeline 30

31 Grenzebach Glier & Associates, Inc. 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. 31

32 Grenzebach Glier & Associates, Inc. Thank you for your Time! – Questions? 32