1. Articulating Tennis Machine Group 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. Vin NTE1929 Vout R1= 330 ohm R2= 1800 ohm GND 1K.1 µF 1 µF NTE1929Voltage Regulator

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 OriginalImproved Feed Rate 5 sec Ball Capacity 28 balls Power Source 6 D-Cell Batteries 12 V Rechargeable Battery Battery Life up to 10 hrs.up to 20 hrs. Arc Length 12, 14, 16, 18, or 20 ft.* varies 15 to 20 ft. Vertical Angle Range 0º25º Horizontal Angle Range 0º60º Price$230Original + $325 = $555 * 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