Reflective photoelectric switch tracking module KY-033

Reflective photoelectric switch tracking module KY-033

Sensors
DET583
Part.No: KY-033
€2.50
In Stock
Immediate Dispatch
KY-033 Reflective Photoelectric Switch Tracking Module – IR line-following sensor with 2.5V–12V operating range, optimized for 5V systems. Ideal for Arduino robots and line-tracking projects.

 

The KY-033 Reflective Photoelectric Switch Tracking Module (MPN: KY-033) is a compact infrared line-detection sensor designed for line-following robots and proximity detection applications. It emits infrared light and reads the reflected signal to distinguish between light and dark surfaces — making it a go-to choice for makers and students building Arduino-based robots or obstacle-avoidance systems.

Key Features

  • Wide Supply Voltage Range: 2.5V – 12V → works across a broad range of microcontroller setups, from battery-powered projects to bench-powered boards. 5V is the recommended supply for optimal lifespan and performance.
  • Working Current at 5V: 18–20mA → hardware-tuned for maximum noise and capacitive interference rejection at this current range, ensuring reliable readings in varied environments.
  • Detection Distance: ~2cm on white surface → the detection range varies with surface color; lighter (whiter) surfaces reflect more IR and are detected at greater distances.
  • Color-dependent sensitivity → darker surfaces absorb more IR light, resulting in a shorter effective detection range — useful for distinguishing line markings on a track.

Pinout & Wiring

PINSymbolDescription
1VCCPower supply positive (2.5V – 12V, 5V recommended)
2GNDGround
3S / OUTDigital signal output (HIGH/LOW based on surface reflection)

Wiring note: Connect VCC to your board's 5V pin, GND to ground, and the signal pin (S) to any available digital input pin on your Arduino. No additional components required.

Compatibility

  • Arduino UNO / Nano / Mega: Fully compatible — 5V supply matches the module's preferred operating voltage and the digital output works directly with Arduino digital input pins.
  • ESP32 / Raspberry Pi (3.3V logic): Can be powered at 3.3V (within the 2.5V–12V range), but verify logic-level tolerance on your specific board before connecting the signal line directly.

Typical Applications

  • Line-following robots: Detect black tape or white lines on a track surface — the classic use case for the KY-033.
  • Object proximity detection: Sense the presence of a nearby reflective surface at short range (~2cm).
  • Tape/mark detection on conveyor systems: Trigger events based on surface markings in DIY automation projects.
  • Arduino starter projects: A straightforward module for learning analog/digital sensor integration with Arduino.
  • Robot obstacle avoidance: Detect floor edges or surface changes to prevent robots from falling off tables.

Technical Specifications

ParameterValue
InterfaceDigital output
Supply Voltage2.5V – 12V (5V recommended)
Working Current (5V)18–20mA
Detection Distance~2cm (white surface)
Detection TypeReflective infrared (IR)
MPNKY-033

FAQ

Q: Can I use the KY-033 with a 3.3V board like the ESP32?
A: Yes — the module operates from 2.5V to 12V, so 3.3V supply is within spec. However, ensure your board's digital input pin is compatible with the module's output signal level before connecting directly.

Q: Why does detection distance change with surface color?
A: Lighter surfaces (white) reflect more infrared light back to the receiver, increasing the effective detection range. Darker surfaces absorb IR, reducing the reflected signal and shortening the detectable distance.

Package Contents: 1× KY-033 Reflective Photoelectric Switch Tracking Module
⚠ Warning: Do not exceed 12V supply voltage. Operating above this limit will shorten sensor lifespan. The 5V supply is strongly recommended for optimal and reliable performance.
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