Infrared (IR) radiation serves as one of the most reliable wireless transmission mediums in modern arcade cabinet design. Because infrared light operates outside the visible light spectrum (typically between $850\text{ nm}$ and $950\text{ nm}$ wavelength), it allows arcade machines to detect rapid physical game actions—such as a basketball passing through a hoop or a coin dropping through a optical chute—without physical contact, mechanical friction, or wear over time.
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An arcade IR sensor setup functions primarily as an optical break-beam (photo-interrupter) or reflective proximity detector, converting physical movement into digital high/low logic signals processed by the game's main CPU.
1. Core Component Breakdown of an Arcade IR Circuit
A standard arcade infrared detection circuit relies on four primary electronic components operating in pairs:
+5V / +12V DC ──[Resistor R1]──> (IR Transmitter LED) ── ── ── ──> (Photodiode / Receiver) ──[Resistor R2]──> [Signal OUT to CPU]
[Invisible IR Beam]
A. Infrared Transmitter (IR LED)
Function: Acts as the optical emitter. It continuously projects an invisible infrared light beam across a designated target gap or zone.
Characteristics: Appears clear or light blue in physical appearance, but emits non-visible light when forward-biased with a small DC current.
B. Infrared Receiver (Photodiode / Phototransistor)
Function: Acts as the light detector. When the incoming IR beam strikes the receiver's semiconductor junction, its internal electrical resistance drops, allowing current to flow.
Characteristics: Often enclosed in a dark-tinted or black epoxy housing to filter out ambient room lighting and prevent false optical triggers.
C. Current-Limiting Resistors
Protect the IR LED from burning out due to over-current from the $+5\text{V}$ or $+12\text{V}$ power rails, and stabilize the output signal threshold on the receiver side.
D. Indicator LED (Status LED)
Mounted directly on the sensor's printed circuit board (PCB) to provide instant visual feedback to arcade technicians:
Beam Unbroken: Indicator LED lights up (or turns off, depending on logic layout).
Beam Broken (Object Detected): Indicator LED toggles state instantly.
2. Common Applications in Arcade Cabinets
Infrared sensor arrays are deployed across various arcade game genres where mechanical microswitches would either break under impact or slow down gameplay:
Basketball Redemption Games (e.g., Street Basketball, Pop-A-Shot):
Location: Positioned inside the rim or lower net assembly.
Function: Registers points instantly as the basketball breaks the IR beam passing through the hoop.
Ball Drop & Hole Targets (e.g., Slam A Winner, Hole in One, Hungry Dog):
Location: Mounted along scoring chutes, hole funnels, and feeder tracks.
Function: Detects balls falling into target holes to calculate precise scoring without slowing down ball velocity.
Arcade Bowling & Skeeball (e.g., Lane Master, Alley Ball):
Location: Positioned along the foul line and target scoring pockets.
Function: Detects foul line infractions and tracks ball entry speeds/paths into high-value scoring rings.
Ticket Dispensers & Coin Validators:
Location: Inside ticket feed tracks (e.g., Deltronic DL-1275) and electronic coin comparators.
Function: Counts physical paper notches to verify payout quantities and checks coin drop timing to prevent token cheating.
Rotary Motor & Wheel Speed Encoders (e.g., Super Match, HockeyZoo):
Location: Mounted adjacent to slotted timing wheels on motor shafts.
Function: Counts motor revolutions per minute (RPM) and establishes home position indexing for rotating playfield wheels.
3. Step-by-Step Diagnostic & Maintenance Guide for Technicians
When an arcade target fails to register scores (e.g., basketball points not counting, or ticket dispenser running endlessly), follow this diagnostic procedure:
Master Comparison: Mechanical Switches vs. Optical IR Sensors
| Parameter | Mechanical Microswitches (Needle / Lever) | Optical Infrared (IR) Sensors |
| Physical Contact | Requires direct impact/pressure from object | Non-contact (detects via light obstruction) |
| Wear & Tear | High (levers bend, internal contacts oxidize) | Extremely Low (no moving mechanical parts) |
| Response Speed | Slower (constrained by physical spring bounce) | Instantaneous (microseconds response time) |
| Ideal Use Case | Heavy coin drop gates, physical button pushes | High-speed ball chutes, ticket notch counters, wheel encoders |
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