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Agenda Review Problem Statement Customer Requirements

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Presentation on theme: "Agenda Review Problem Statement Customer Requirements"— Presentation transcript:

0 Digital Microfluidics Control System II

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

2 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. Kenny

3 Customer Requirements
Zach H.

4 Engineering Requirements
Zach H. Changed capacitance granularity

5 Risk Assessment Kevin

6 Market Comparison Parameters DropBot NeoPREP Capacitance Precision
~5pF Not Specified Droplet Speed Range 0-70mm/s Impedance Precision Cost $1500 $150,000 Portability Contained Not Portable Size 1’x1.5’x1’ 5’x5’x5’ Mike

7 Market Comparison DropBot NeoPREP Mike

8 Sandia Digital Microfluidics Hub
Pat Start at 2:22

9 Functional Decomposition

10 Morphological Chart Pat

11 Concept Selection Zach S

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

13 Concept Selection Zach S

14 Miniature Circuit Breaker
Trip conditions: 5A; 240V Cost: $18.00 Size: Deck of cards+ Zach S

15 Concept Selection Kenny

16 Server Rack Weight: 2.4 lbs Cost: $60.00 Size: ~Toaster oven Kenny

17 Concept Selection Zach H

18 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 + Zach H

19 System Architecture Mike

20 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) Mike Example Circuit

21 Feasibility Analysis - Amplifier
Amplifier Requirements Input AC Voltage ~117 V Input AC freq. 60 Hz Peak Output Voltage 170 Vrms Capacitive Load 10 nF Cut off frequency 100 kHz Voltage gain ~48 dB Input Resistance 20 kΩ Ambient Temp. 25 C 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. Adam

22 Feasibility Analysis - Cost
Electrical Components Cost (USD) Control Board $20.00 I/O Board $50.00 Arduino Mega $25.99 Crystal Oscillator $1.00 Amplifier $250.00 Mini Circuit Breaker $5.00 Mechanical Components Server Rack $200.00 Fan + Heatsink $60.00 Rough estimate of Total Cost ~ $600 Assigned budget is $2000 Adam

23 Feasibility Analysis - Weight
Kenny Engineering Requirement: <13,600 g

24 Engineering Analysis to be Completed
Electrical Component Tolerances Noise Analysis Power Consumption Speed of computation Mechanical Structural Shock & Vibration Heat Electrical Present First: Zach S Mechanical Present Second: Pat

25 Project Plan Pat

26 Questions?

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