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Small black plastic sensor with IR LED phototransistor and two resistors

Adafruit

Adafruit Reflective IR Sensor 470 10K Resistors Engineering Development Tool

SKU CH-81Z5-8TN6J

Detects light-coloured objects up to 5mm away using an IR LED and phototransistor, and includes 470 ohm and 10K resistors for circuit integration

  • TypePrototyping Products
  • Detects light-coloured objects at ~5 mm range
  • Dark surfaces absorb IR and remain invisible
  • Includes 470 ohm LED bias and 10K pull-up resistors
  • Simple plastic housing with IR LED and phototransistor
  • Ideal for object-passage detection or basic rotary encoding

Reflective IR Sensor for Prototyping

This sensor pairs an IR LED with a phototransistor in a simple plastic casing. It detects light-colored objects at roughly 5 mm distance. Dark or black surfaces absorb the IR light and remain undetected. The module includes a 470 ohm resistor for the LED and a 10K resistor for the phototransistor pull-up.

Detecting Object Passage and Encoder Tasks

The sensor suits projects that need to know when an item passes a fixed point. It can also read striped encoder wheels to measure rotational speed. Builders who need reliable detection of dark surfaces or longer sensing ranges should choose a different technology.

Close-Range Reflectivity Sensing

White and light materials reflect enough IR to trigger the phototransistor reliably at the specified gap. Performance drops quickly beyond that distance or with low-reflectivity targets. The included resistors simplify breadboard wiring for immediate testing.

I korthet

  • Detects light-coloured objects at ~5 mm range
  • Dark surfaces absorb IR and remain invisible
  • Includes 470 ohm LED bias and 10K pull-up resistors
  • Simple plastic housing with IR LED and phototransistor
  • Ideal for object-passage detection or basic rotary encoding

Specifikationer

TypePrototyping Products

Frågor om den här produkten

What mounting options does the simple plastic casing of this reflective IR sensor provide?

The sensor has a simple plastic casing with no integrated mounting holes or brackets; it is designed for breadboard or custom fixture use.

How do I wire the included 470 ohm and 10K resistors when installing this sensor on a breadboard?

Use the 470 ohm resistor to bias the IR LED anode, and the 10K resistor as a pull-up on the phototransistor collector to the supply rail.

Will the IR LED or phototransistor in this sensor require periodic replacement under normal use?

The IR LED and phototransistor are solid-state components with no moving parts and do not require scheduled replacement.

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