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Painter’s Palette

Painter’s Palette. Group #26 Ofer Eckstein Christopher Tempel Shaival Shah . Introduction. Automatic tool Accurate and precise. Features. Compact design Needs 4 colors Easily expandable design Low cost Easy to operate Processing indicator. Objective. Saves paint

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Painter’s Palette

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  1. Painter’s Palette Group #26 Ofer Eckstein Christopher Tempel Shaival Shah

  2. Introduction • Automatic tool • Accurate and precise

  3. Features • Compact design • Needs 4 colors • Easily expandable design • Low cost • Easy to operate • Processing indicator

  4. Objective • Saves paint • Reproduces color accurately • Allows new forms of art • Handy tool for painters • Useful for art education

  5. System Overview

  6. User Input Interface • Dip switches • 2 switches per color • 2 switches for size • 1 make button

  7. Microcontroller • PIC 16F877A • Inputs from user input interface • Calculates and outputs timed pulses to H-bridge

  8. Why use a PIC? • Cheap and compact • Very versatile • Adequate computational resources • Very precise timed pulses with a 20MHz clock

  9. Timing Equation • Consistent proportioning of colors • Red motor delay = Size/(1+(y+b+w)/r) • Yellow motor delay = Size/(1+(r+b+w)/y) • For Ex: if Size=5 (sec), r=1, y=2, b=0, w=0 • Red motor delay = 1.66s • Yellow motor delay =3.33s

  10. Output Cycle • Small size

  11. Output Cycle • Medium Size

  12. Output Cycle • Large Size

  13. Flowchart

  14. Output Function

  15. H-bridge • L298 • Inputs from microcontroller • Outputs to motor • Used to drive motors • Supplies required current

  16. Motor • Firgelli PQ12 actuator • Compact miniature size • Simple control • Low voltage • Equal push/pull force

  17. Chassis • Four wooden containers • 7.4cm x 8.4cm x 8.4cm

  18. Cost Structure

  19. Paint Flow Test

  20. Paint Flow Test

  21. Successes & Challenges • Successes: • Accurate performance of motors in response to user input • Precise output cycle (100% accuracy) • Challenges: • User has to use binary • Variable paint flow • Relies on paint viscosity

  22. Future Development • Hardware • Add sensors for paint level • Non-binary inputs • Pressure controlled paint dispensing • Software • Computerized color selection • Feedback control for motors

  23. THANK YOU! Questions?

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