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Puzzled

Puzzled. Design Presentation 2. Senior Projects 2011 Eric Babski ~ Ben Gagne ~ Erik Artus. Agenda. Problem Statement Solution System Diagram Sub-system Descriptions Microphone Circuitry LCD Software Schedule Budget. Problem Statement.

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Puzzled

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  1. Puzzled Design Presentation 2 Senior Projects 2011 Eric Babski ~ Ben Gagne ~ Erik Artus

  2. Agenda • Problem Statement • Solution • System Diagram • Sub-system Descriptions • Microphone • Circuitry • LCD • Software • Schedule • Budget

  3. Problem Statement • Our team was given the challenge to design a machine that improves the method of counting puzzle pieces for quality control. • The current method requires a human counting by hand piece by piece. • This is too time consuming, labor intensive and impractical.

  4. Problem Solution We plan to use a combination of a pneumatics system and electronics to count pieces as they are loaded into the machine. • Air System • Microphone/Amplification • User Interface

  5. System Diagram Pieces In-Feed Hopper Microphone Circuitry Air Inlet *tink LCD Display Air Outlet Start Button Stop/Reset Catch Drawer

  6. Microphone Requirements • Must run off 3 volts. • Frequency range within that of a dropped piece. • Sample at 1000 Hz.

  7. Microphone Details • WM-52B • Specifications: • Runs on 2.5VDC • Frequency: 20-16k HZ • Impedance: Less than 2.2k

  8. Testing • We used LabView to test the output of our microphone. • Dropped 3 pieces. 1 2 3

  9. Results Our LabView test results show… • Gain • We found that the voltage spikes we were getting were in the 500mV range. • Noise • There is a lot of noise produced at the output of the microphone. • Filtering • Time Delay Secondary Spikes Outside Noise

  10. Op-Amp • Needed to run single-ended. • Between 0-3 volts at the supply. • Readily available. INA 126P G = 5+(80k/RG)

  11. Circuitry Gain Calculation G = 5+(80k/RG) 6 = 5+(80k/RG) RG = 80K

  12. LCD • Requirement: • Need at least 12 Characters • Inexpensive • Specifications: • High quality STN 16x2 character LCD • 3.3V power supply • Yellow LED Backlight • Cost $14

  13. Software • Program • The microphone that we are using is basically a capacitor. When audible noise surrounds the microphone, the voltage absorbed by the capacitor changes. • Our software will be monitoring the voltage in the capacitor, and will use that information to keep a running count of how many puzzle pieces have triggered a spike.

  14. State Machine

  15. Budget

  16. Questions?

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