Mechanical Artillery: Ping Pong Ball Cannon
The Ping Pong Ball Cannon is an intense foray into advanced robotics. It requires balancing dual high-RPM motors (the firing mechanism) with the slow, precise movement of the pan/tilt geometry turret. It is the ultimate desk defense system.
The Friction Flywheel Launch Mechanism
You cannot launch a ping pong ball effectively by hitting it. You must squeeze it.
- The Flywheels: Two extremely fast Coreless DC motors or Brushless Drone Motors are mounted facing each other with 3D-printed rubberized wheels.
- The gap between them is slightly smaller than a ping pong ball (approx 38mm).
- The Arduino uses two powerful Logic Level MOSFETs (or an ESC for brushless motors) to spin both wheels inward at 10,000+ RPM.
- The Feeding Servo: When commanded to "Fire", a standard SG90 Servo hidden in the magazine tube pushes a single ball forward until it touches the spinning flywheels. The friction instantly grabs the ball and violently rips it out the barrel!
Turret Control and Targeting
- The entire heavy assembly is mounted on a Pan/Tilt bracket powered by massive MG996R Servos.
- The operator uses dual joysticks connected to the Arduino to aim the turret.
- By varying the PWM speed of the top and bottom flywheels independently via a potentiometer dial, the operator can actively create "Topspin" or "Backspin" on the ball, altering its trajectory in mid-air!
Required Arsenal
- Arduino Uno/Mega: The Fire Control Computer.
- High-Speed DC Drone Motors (e.g., 8520 coreless) or Brushless Motors with ESCs.
- Heavy Duty Servos for panning / Micro Servo for feeding.
- A 3D printed barrel, magazine, and friction wheels.
- LiPo Battery Pack: Essential for providing the immense Amp draw required for fast motor spool-up.