Controller Components Overview

• Video game controllers = precision devices for competitive battlefields, uncharted worlds, epic storylines
• Mystery element: circular metal object location and function
• PlayStation 4 DualShock controller teardown process
• Outer plastic housing removal reveals internal components

Physical Component Layout

• Top layer: D-pad, triggers, various buttons
• Below buttons: Conductive rubber button gaskets
• Contact layer: Flexible plastic contact board
• Center: Touch pad + small speaker
• Mid-frame: Structural support
• Primary PCB: Main printed circuit board

PCB Components (Top Side)

• Microcontroller unit (controller "brains")
• Pair of analog joysticks
• Wireless communication microchip
• Antenna
• Headphone jack
• Additional EXT port (seldom used applications)
• Set of push buttons

PCB Components (Bottom Side)

• Flat cable connectors
• Audio codec microchip
• Accelerometer and gyroscope microchip

Power and Feedback Systems

• Below PCB: Battery case + rechargeable lithium-ion battery
• Mid-frame attachments: Motors with off-balance weights
  • Purpose: Controller vibration when spun up
• Back housing: Additional PCB/daughter board
  • Micro USB port
  • Multi-color LED
  • Plastic light guides for triangular controller light illumination

Button Mechanism Analysis

• Standard buttons: 3-part system
  • Plastic front face
  • Rubber button gasket (conductive bottom)
  • Flexible plastic contact board
• Contact board: Intricate wire traces protected by insulating plastic
• Operation: Gap in wire below each button breaks electricity path
• Button press: Conductive pad bridges gap → circuit closes → electricity flows
• Button release: Rubber gasket design pulls conductive bridge away → circuit breaks

Trigger Mechanism (L2/R2)

• Different from standard buttons: No gap bridging system
• Technology: Pressure sensitive resistors
• Operation: Rubber gasket applies force to pressure sensitive resistor
• Measurement: Resistance change measured by microcontroller

Analog Stick Construction

• Mounting: Solder mounted to PCB
• Components: Almost dozen different internal parts
• Top assembly: Rubber thumb pad + plastic joystick shaft
• Housing: Metal housing limits joystick movement
• Internal mechanism: Pair of perpendicular plastic brackets ("followers")
• Function: Convert up/down/left/right movements → small rotations
• Attachment: Each bracket connects to potentiometer

Potentiometer Mechanism (Mystery Metal Piece)

• Location revealed: 4 metal discs per controller (inside potentiometers)
• Component name: "Wiper"
• Housing: Plastic containing electrically resistive material
• Track design: Printed in 2 circles on inside
• Key principle: Electrical resistance ∝ length of resistive material
• Operation: Wiper rotation changes contact position on track
• Result: Varies effective length of resistive material → changes overall resistance
• Measurement: Microcontroller easily measures resistance changes

Wiper Design and Function

• Physical design: Metal bent to continuously press against track at exact locations
• Precision: Enables precise joystick movement measurement
• Critical for: Esports and competitive gaming applications
• Terminal configuration: 3 terminals per potentiometer
  • 1 connects to wiper
  • 2 connect to each track side
• Coverage: Similar setup in all 4 potentiometers (left/right, up/down motions)

Additional Analog Stick Features

• Press function: Small assembly below stick presses push button when analog stick pressed in
• Return mechanism: Spring returns analog stick to center position and unpressed state

Design Universality

• Construction type similar across video game controllers
• Considerable variation in layout and design between manufacturers