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Articulating Tennis Machine Group 14

Articulating Tennis Machine Group 14. Members: Jerrod Stock David Villers. Instructor: Dr. Yenumula Reddy. Overview. Background Architecture Hardware Use Case Operation Final Comparison Afterthoughts Further Improvements. Background. Tennis Twist Machine

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Articulating Tennis Machine Group 14

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  1. Articulating Tennis MachineGroup 14 Members: Jerrod Stock David Villers Instructor: Dr. Yenumula Reddy

  2. Overview • Background • Architecture • Hardware • Use Case • Operation • Final Comparison • Afterthoughts • Further Improvements

  3. Background • Tennis Twist Machine • Machine Designed for Beginning Players • Tennis Twist only can fire up to a maximum distance of 20 feet • Projects a ball every 5 seconds • Shoots straight out to approximate same location each time • Goal: Create variation in depth and horizontal location of launched balls.

  4. Architecture Diagram

  5. Electronic Hardware • Arduino Microcontroller • L298N Motor Driver • 12 – 9 V Voltage Regulator • 2 DC Gear Motors • 12 Volt Battery with Charger

  6. Electronic Hardware

  7. Arduino Uno Microcontroller • Programmed to control horizontal motor. • Generates random intervals and applies intervals to motor operations. • 4 to 8 seconds ‘On’; 2 to 3 seconds ‘Off’.

  8. Arduino Uno Microcontroller

  9. L298N Motor Driver • Takes 5 V output signal from microcontroller and amplifies it to 12 V. • 12 V signal then drives the horizontal motor.

  10. L298N Motor Driver

  11. Voltage Regulator • Drops 12 V down to 9 V • Necessary for safe input voltage to the microcontroller. Vout NTE1929 Vin R1= 330 ohm .1 µF R2= 1800 ohm 1 µF 1K NTE1929Voltage Regulator GND

  12. Voltage Regulator

  13. DC Gear Motor – Horizontal Control • Gear motor has cam hub that drives shaft. • Shaft attaches to turntable which will pan horizontally

  14. DC Gear Motor – Vertical Control • Gear motor has cam hub that raises and lowers hinged plate. • Wire cable is used in lifting instead of shaft.

  15. Common Power Source: 12 V Battery • Added to Tennis Twist wiring so launching mechanism also operates off 12 V battery.

  16. Use Case Diagram

  17. Controls • Main • Arduino • Vertical • Horizontal • Twist

  18. Input for Operation Modes • Original Tennis Twist • Main ‘On’ – Twist ‘On’ • Horizontal Variation Only • Main ‘On’ – Arduino ‘On’ – Horizontal ‘On’ – Twist ‘On’ • Vertical Variation Only • Main ‘On’ – Vertical ‘On’ – Twist ‘On’ • Horizontal & Vertical Variation • Main ‘On’ – Arduino ‘On’ – Horizontal ‘On’ – Vertical ‘On’ – Twist ‘On’

  19. Final Comparison * Arc length cannot be changed on original machine while in operation.

  20. Afterthoughts • Went a little over budget • Goal: $300 • Actual: ~$325 • Still an improvement upon cost of next-level machine (~$700) • (Original Tennis Twist) $230 + $325 = $555 • Project was much more mechanically involved than anticipated.

  21. Possible Further Improvements • Further Safety Features • External housing around unit to surround moving parts • Alternative User Input Methods • Increased Ball Capacity • Would require some physical redesign.

  22. Questions

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