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Digital Microfluidics Control System II

Digital Microfluidics Control System II. P15610. Agenda. Review Problem Statement Customer Requirements Engineering Requirements Risk Assessment Market Comparison Functional Decomposition Morphological Chart Concept Selection System Architecture Feasibility Analysis Project Plan.

kyle-middleton
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Digital Microfluidics Control System II

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  1. Digital Microfluidics Control System II P15610

  2. Agenda • Review • Problem Statement • Customer Requirements • Engineering Requirements • Risk Assessment • Market Comparison • Functional Decomposition • Morphological Chart • Concept Selection • System Architecture • Feasibility Analysis • Project Plan

  3. Problem Statement Current state - The current control system is not self contained and uses a class AB amplifier which makes the system large and nonmodular. Desired state - A fully enclosed control system that efficiently operates the DMF chip while providing accurate feedback. Project Goals - Make key improvements to functionality of control system, and complete all assigned deliverables. • Repeatable, consistent droplet motion. • Durable, lightweight, modular design. Constraints - Use provided DMF chip, control fluid droplets using electrowetting, use DI water as test fluid, ensure compatibility with peripheral hardware and GUI.

  4. Customer Requirements

  5. Engineering Requirements

  6. Risk Assessment

  7. Market Comparison

  8. Market Comparison DropBot NeoPREP

  9. Sandia Digital Microfluidics Hub

  10. Functional Decomposition

  11. Morphological Chart

  12. Concept Selection

  13. Oscillator and Demultiplexer Temperature range: -10C to 60C Cost: $1.00 each Frequency: 100 kHz+ Size: Diminutive

  14. Concept Selection

  15. Miniature Circuit Breaker Trip conditions: 5A; 240V Cost: $18.00 Size: Deck of cards+

  16. Concept Selection

  17. Server Rack Weight: 2.4 lbs Cost: $60.00 Size: ~Toaster oven

  18. Concept Selection

  19. Mechanical Heat Sink With Fans Airflow (HS/fan): 55/30 ft3 /min Cost (HS/fan): $45.00/$4.00 Weight (HS/fan): 1.4 lbs/<1 lbs Size (both): Deck of cards +

  20. System Architecture

  21. Feasibility Analysis - Capacitive Measurements Capacitive sensor circuit • Circuit should be able to measure 0.01pF change in capacitance • Sampling Frequency = 4MHz • Requires a comparator • Inexpensive (~$3.00) Example Circuit

  22. Feasibility Analysis - Amplifier • Requirements are based off the amplifier used in the previous project. • The current design will use two cascaded common emitter BJTs with a crystal oscillator providing a frequency of 100kHz.

  23. Feasibility Analysis - Cost • Rough estimate of Total Cost ~ $600 • Assigned budget is $2000

  24. Feasibility Analysis - Weight Engineering Requirement: <13,600 g

  25. Engineering Analysis to be Completed Mechanical • Structural • Shock & Vibration • Heat Electrical • Component Tolerances • Noise Analysis • Power Consumption • Speed of computation

  26. Project Plan

  27. Questions?

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