GP2Y0A21YK0F Infrared Distance Sensor, 10–80 cm, Analog

The GP2Y0A21YK0F is an integrated infrared distance measuring sensor unit that detects objects within a 10 to 80 cm range. It uses optical triangulation to provide reliable readings regardless of object reflectivity, ambient temperature, or operating time. This module is ideal for robotics hobbyists, students, and makers building obstacle-avoidance or proximity-sensing projects.

Optical triangulation sensing

The sensor integrates a position sensitive detector (PSD), an infrared emitting diode (IRED), and signal processing circuitry. Because it relies on triangulation, distance measurement remains stable against varying surface reflectivity and ambient conditions.

Analog voltage output

The module produces an analog voltage corresponding directly to the detected distance. This straightforward output makes it suitable for both continuous distance measurement and general touch-less proximity sensing.

Typical applications

Common use cases include robot cleaners, touch-less switches for sanitary or illumination control, and energy-saving presence detection in vending machines, copiers, and ATMs.