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Published byShauna Bryan Modified over 9 years ago
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Articulating Tennis Machine Group 14 Members: Jerrod Stock David Villers Instructor: Dr. Yenumula Reddy
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Overview Background Architecture Hardware Use Case Operation Final Comparison Afterthoughts Further Improvements
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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.
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Architecture Diagram
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Electronic Hardware Arduino Microcontroller L298N Motor Driver 12 – 9 V Voltage Regulator 2 DC Gear Motors 12 Volt Battery with Charger
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Electronic Hardware
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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’.
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Arduino Uno Microcontroller
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L298N Motor Driver Takes 5 V output signal from microcontroller and amplifies it to 12 V. 12 V signal then drives the horizontal motor.
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L298N Motor Driver
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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
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Voltage Regulator
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DC Gear Motor – Horizontal Control Gear motor has cam hub that drives shaft. Shaft attaches to turntable which will pan horizontally
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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.
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Common Power Source: 12 V Battery Added to Tennis Twist wiring so launching mechanism also operates off 12 V battery.
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Use Case Diagram
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Controls Main Arduino Vertical Horizontal Twist
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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’
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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.
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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.
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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.
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Questions
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