Product Description This module is a slot-type photoelectric sensor designed for non-contact detection and counting applications. It uses an infrared emitting and receiving pair housed in a slotted structure. When an object passes through the slot and blocks the infrared beam, the output signal changes state. An onboard comparator circuit converts the optical signal into a digital high or low level output. The module operates on a DC voltage range of 3.3V to 5V and can be connected directly to microcontrollers. It is suitable for speed measurement, rotation counting, position detection, and encoder-based feedback systems in electronic development projects.  Technical Specifications Sensor Type: Slot-type photoelectric optocoupler sensor Detection Method: Infrared beam interruption Operating Voltage: DC 3.3V – 5V Output Type: Digital output (High / Low) Signal Conditioning: Onboard comparator circuit Detection Mode: Non-contact optical detection Interface Pins: VCC, GND, DO Response Type: Fast optical switching response Mounting Type: Through-hole pin header PCB Size: Approx. 32mm × 14mm Application Type: Counting, speed measurement, position detection