Portable BAC Analyzer

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Portable BAC Analyzer
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Member Responsibilities
Neil Egger (Team Leader) Trey Fox Jodie Williams Blake McMullan
Research X X
Prototype Design X X
Tech Writing X
Purchase Parts X X
MS Project X X X X
Simulations X
Testing X X
Web Page X
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Abstract

• Our team will design a breath analyzer to compete
  with medium range models currently on the market,
  in terms of both price and accuracy.
• Primary challenges of the project
• Accuracy
• Cost
• Packaging

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Technical and Practical Constraints
Constraints
Name Description
Sensor Semiconductor Oxide Sensor
Range 0.00 - 0.40
Accuracy 10 of actual BAC
Calibration Self calibration with each use
Power 6.0 Volt Camera Battery
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Technical Constraints
Name Description
Sensor Semiconductor Oxide Sensor
Range 0.00 - 0.40
Accuracy 10 of actual BAC
Calibration Self calibration with each use
Power 6.0 Volt Camera Battery
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Practical Constraints
Name Description
Cost lt 50.00
Safety Smooth Edges
Reliability 5 years
Size 4.25 tall, 2 wide, 1 deep
Weight lt 1 lb.
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Objectives

• Design a reliable breath analyzer that
• is accurate within 10
• is competitively priced
• consumes little power
• gives consistent results

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User Interface

• The Portable BAC Analyzer is
• designed to aid the user in
• making safe decisions
• concerning the operation of a
• motor vehicle by indicating
• blood alcohol contents
• ranging from 0.00 to 0.40.

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Block Diagram
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Oxide Sensor

• TGS 2620 Ethanol Sensor
• Low Power Consumption
• High Sensitivity to alcohol
• Long life and low cost

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PIC Pinout Configuration
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Power Supply

• Camera Battery
• 6V (1)
• 250mAH

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Camera Battery
Battery good for approx. 45 min. of continuous use
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Watch Batteries
Neither of these batteries will work
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Simulations

• 2nd order polynomial function generated by
  Matlab.
• BAC 0.0425x² - 0.0977x 0.0406 where x is the
  voltage across the load resistor.

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Software

• Takes A/D values from gas sensors load resistor
  and from temp sensor
• Uses an equation to determine corresponding BAC
  using these values
• Can also display ambient temperature
• Auto power off feature saves battery life

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Old Power ConsumptionBreakdown

• Oxide Sensor 40 mA
• PIC 5 mA
• Display 250 mA
• Total 295 mA

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New Power Consumption

• Oxide Sensor 40 mA
• PIC 5 mA
• Display 10 mA
• Total 55 mA

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PCB Board
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Component Cost
Item Part Name Part Quantity Per Breathalzyer Cost() Volume Discount Quantity Manufacturer
1 Gas Sensor TGS2620 1 4.85 10000 Figaro
2 PIC Microcontroller PIC16F873A-I/SO 1 3.98 10000 Microchip
3 Temp Sensor TC1047AVNBTR 1 0.49 10000 Microchip
4 Voltage Regulator MCP1700 1 0.46 10000 MicroChip
5 3 Digit 7 Segment Display 160-1545-5-ND 1 1.50 10000 LITEON
6 Additional Packaging Costs ??? 1 ???? 10000 Multiple
  Total Cost     12.50    
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Future Work

• PCB Layout
• Temperature Accuracy
• Packaging

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Acknowledgements

• Dr. Joe Picone
• Dr. Nick Younan (Advisor)
• Peter Trenkle (Industrial Advisor)
• MSU ECE Department
• IEEE
• Cypress Semiconductor
• Dr. Bob Reese

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Questions?