P16551:Observer Calibrator

Antonio DoVale, Ben Grotton, Kevin Kruse, Alex Skinner, Zhen Zhou

AgendaReview and Update

Background reviewCustomer requirementFunctional decompositionFunctional mapping

Subsystem DesignErgonomic feasibilityDecision of light sourceDecision of microcontrollerDecision of mixing moduleSoftware overseeHousing/ Mixing module design

Other AnalysisBill of materialsBudget estimationTest planRisk assessmentProject week 12 schedule

What is the Observer Calibrator?● The Observer Calibrator is an instrument

that can measure slight differences in human color perception.

● Contains two arrays; each comprises 4 different colored LEDs which are blended together to generate millions of colors.

● The LED arrays are controlled using MATLAB.

Current product- Observer Calibrator ● Current weight and size are too big

● Hard to transport

● Difficult to use (poor user-interface)

● Low illumination level

● Poor housing structure

Problem Statement SummaryProject Goals:● Analyze current prototype● Develop working model of OC instrument

Desired Functional Improvements:● Brighter● Easier to use● Portable● Interchangeable optical front end

Additional Requirements:● Complicit with FDA/RIT human subject testing regulations● Available documentation for continued support in RIT color science research

Customer Requirements and Needs

Safe luminance levels

Customer Requirements and Needs (Cont.)

≥

Subsystem Functional Decomposition

Subsystem Functional MappingSend Signal to Each Primary

Send Signal to Each Primary

Mix Light Colors

Send Light Through Aperture

Send Light Through Aperture

Send Light Through Aperture

Send Light Through Aperture

Send Signal to Each Primary

Output ResultsDisplay Current Energy Levels, Compare Energy Levels

Meet Observer Eye Level

Meet Observer Eye Level

Mix Light Colors

Ergonomic Feasibility Analysis - Stand

Adjustable height (minimum) = 32.8-27.4 = 5.4 inches

(Wickens Table of Anthropometric Data)

Ergonomic Feasibility Analysis - Stand

Ergonomic Feasibility Analysis - StandBottom Top

Selection Criteria X stand Tripod I beam Folded Clip Screws Panel Angle adjustment N Y N Y - - -Height adjustment Y Y Y Y - - -Dimension adjustable - - - - Y N NWeight support (>20lb) Y Y Y N - - -Stability Y Y Y Y Y Y Y

Score 3 4 3 3 2 1 1Continu? Y Y

Decision Making for Light Sources

● The graph to the right shows regions of greater perception differences among different observers

● One set of LEDs should lie within these high variability regions

A HANDY CALIBRATOR FOR COLOR VISION OF A HUMAN OBSERVERPatrick Morvan, Abhijit Sarkar, Jurgen Stauder, Laurent Blondé, Jonathan Kervec, Hasan Sheikh Faridul

Decision Making for Light Sources

Decision Making for Microcontroller

Purchase Plan: Through Progressive Automations for $47.50

Purchase Plan: Through Adafruit for $17.50

Decision Making for Mixing Module: Make vs. BuyPros for Make:

● Cost (cheaper to make the part)● Need for specific aperture diameter● Control of lead time/improved quality control

Pros for Buy:

● Suppliers specialized know-how / advanced manufacturing techniques● Lack of expertise● Small-volume need

Potential Suppliers: Integrating Sphere

Software Overview & Flowcharts● Will use Matlab’s Support Package for Arduino to send commands to the

PWM ports and control the LEDs○ Ex: writePWMDutyCycle, writePWMVoltage

● Will probably write some programs to process commands ○ Could be tailored to use cases (observer color adjustment vs. researcher color

adjustment)

Software Flowcharts (continued)

Design Drawing of HousingIso Top View (Front - Top Removed) Iso Top View (Rear - Top Removed)

Design Drawing of Integrating Sphere

Twin Integrating Spheres (Front iso view) Twin Integrating Spheres (Rear iso view)

Full Housing/Mixing Module Design

Preliminary LED Prototyping

Prototype Schematic

Prototype Simulation

LED Prototyping: Moving Forward

LED Prototyping: Moving Forward (Cont.)

Bill of Materials

Budget EstimationAssumptions:

● RIT MATLAB License for Academic Use

● Items in green are fully priced out

● Items in orange are estimates

Test Plan - Luminance Levels● We need to ensure we achieve the requisite

luminance levels with each LED○ The Program of Color Science has labs for us to test this

● Each LED should reach 15 cd/m2 at maximum output level

● Software-side adjustments may be needed to keep the output levels within reasonable luminance levels

Risk Assessment

Schedule for Week 12Task Duration Start Finish Resource

Phase 1 - Problem Definition 21 days 1/26/2016 2/9/2016

Phase 2 - System Design 21 days 2/10/2016 3/2/2016

Phase 3 - Subsystem Design 28 days 3/3/2016 3/29/2016Phase 4 - Detailed Design 21 days 3/31/2016 4/19/2016

1 Refine Customer requirement 7 days 3/31/2016 4/7/2017 Team2 Refine risk assessment (high/medium technical risk) 7 days 3/31/2016 4/7/2017 Team3 Update schedule 3 days 4/13/2016 4/16/2016 Team4 Verify readiness 3 days 4/11/2016 4/14/2016 Team

5 System architecture – subsystems address all needs 3 days 4/11/2016 4/14/2016 Team

6 Detailed drawings, schematics, flow charts 7 days 4/11/2016 4/17/2016 Team

7 Feasibility analysis – simulations, prototyping 7 days 4/11/2016 4/17/2016 Team8 Detailed BOM – review against budget 7 days 4/11/2016 4/17/2016 Team9 Communicate with Customer for Suggestions 1 day 4/18/2016 4/18/2016 Dr. Fairchild

10 Upload Everything to EDGE 1 day 4/18/2016 4/18/2016 Team

11 Detailed Design Review 1 day 4/19/2016 4/19/2016 Team

Questions?