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Digital Microfluidics Control System II P15610. Agenda ● Review o Problem Statement o Customer Requirements o Engineering Requirements o Risk Assessment.

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Presentation on theme: "Digital Microfluidics Control System II P15610. Agenda ● Review o Problem Statement o Customer Requirements o Engineering Requirements o Risk Assessment."— Presentation transcript:

1 Digital Microfluidics Control System II P15610

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

3 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. Problem Statement

4 Customer Requirements

5 Engineering Requirements

6 Risk Assessment

7 Market Comparison ParametersDropBotNeoPREP Capacitance Precision~5pFNot Specified Droplet Speed Range0-70mm/sNot Specified Impedance PrecisionNot Specified Cost$1500$150,000 PortabilityContainedNot Portable Size1’x1.5’x1’5’x5’x5’

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 ft 3 /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. Amplifier Requirements Input AC Voltage~117 V Input AC freq.60 Hz Peak Output Voltage 170 Vrms Capacitive Load10 nF Cut off frequency100 kHz Voltage gain~48 dB Input Resistance20 kΩ Ambient Temp.25 C

23 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 Cost (USD) Server Rack$200.00 Fan + Heatsink$60.00 -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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