From Makers Electronics's description

E18-D80NK Photoelectric Switch Sensor (Proximity) 5V 3-80cm The E18-D80NK is a compact infrared (IR) photoelectric proximity sensor designed to detect the presence of objects without physical contact. Inside its small cylindrical plastic housing resides both an IR LED emitter and a phototransistor receiver. The sensor emits invisible infrared light and listens for reflections: when an object enters its field of view and reflects the IR beam, the sensor’s electronics detect the return signal and trigger a digital output. This makes it a non-contact “switch,” ideal for automation tasks where mechanical contact would be undesirable or impractical. What sets E18-D80NK apart is its adjustable detection range via a small onboard potentiometer, you can tune sensitivity to trigger from as close as ~3 cm out to about 80 cm. This adjustability, combined with a relatively narrow sensing angle and diffuse-reflective detection principle, enables more controlled and stable object detection even in environments with varying object types (opaque, translucent, differently colored, etc.). The module draws modest current and runs on standard 5 V logic, making it easy to integrate with microcontrollers and embedded systems. Mechanically simple yet electrically robust, the E18-D80NK is widely used in robotics, automation, and obstacle detection from line-following robots to production-line sensing setups. Its compact form factor and three-wire output (power, ground, signal) mean you can mount it directly on a chassis or bracket and immediately connect to a controller. Because it relies on IR reflection, there is no need for a paired emitter/receiver set, simplifying design and reducing cost. All this makes the sensor a versatile and practical choice for projects requiring reliable proximity detection. Features: Diffuse-reflective infrared proximity sensing (emitter and receiver housed in one module). Adjustable detection range from approximately 3 cm up to 80 cm via onboard potentiometer. Runs on standard 5 VDC supply, compatible with common microcontrollers (Arduino, etc.). Digital (NPN, Normally Open) output simple HIGH/LOW detection signal. Compact cylindrical plastic housing for easy mounting and integration. Low to moderate current consumption (< 100 mA) for efficient operation. Fast response time (< 2 ms) enabling prompt detection. Specifications: Parameter Value Model: E18-D80NK Sensing principle: Infrared diffuse-reflective photoelectric sensor Detection range: 3 cm – 80 cm (adjustable) Supply voltage: 5 VDC Current consumption: 25 mA (idle) up to ~100 mA load/output current. Output type: NPN, normally open (digital) Output load current: Up to ~100 mA. Response time: < 2 ms Housing material: Plastic, cylindrical threaded body (± Ø17–18 mm, length ~45 mm) Operating temperature: –25 °C to +55 °C Mechanical Dimension: Pin Functional Diagram: Applications: Obstacle detection and avoidance in robots. Automation and object-detection on production lines / conveyor systems. Proximity triggering in interactive systems or security / anti-theft devices. Non-contact object sensing for DIY electronics, microcontroller projects, and smart devices. Package Contents: 1x E18-D80NK Photoelectric Switch Sensor (Proximity) 5V 3-80cm Datasheet

From Most Electronic's description

E18-D80NK Photoelectric Switch Sensor (Proximity) 5V 3-80cm The E18-D80NK is a compact infrared (IR) photoelectric proximity sensor designed to detect the presence of objects without physical contact. Inside its small cylindrical plastic housing resides both an IR LED emitter and a phototransistor receiver. The sensor emits invisible infrared light and listens for reflections: when an object enters its field of view and reflects the IR beam, the sensor’s electronics detect the return signal and trigger a digital output. This makes it a non-contact “switch,” ideal for automation tasks where mechanical contact would be undesirable or impractical. What sets E18-D80NK apart is its adjustable detection range via a small onboard potentiometer, you can tune sensitivity to trigger from as close as ~3 cm out to about 80 cm. This adjustability, combined with a relatively narrow sensing angle and diffuse-reflective detection principle, enables more controlled and stable object detection even in environments with varying object types (opaque, translucent, differently colored, etc.). The module draws modest current and runs on standard 5 V logic, making it easy to integrate with microcontrollers and embedded systems. Mechanically simple yet electrically robust, the E18-D80NK is widely used in robotics, automation, and obstacle detection from line-following robots to production-line sensing setups. Its compact form factor and three-wire output (power, ground, signal) mean you can mount it directly on a chassis or bracket and immediately connect to a controller. Because it relies on IR reflection, there is no need for a paired emitter/receiver set, simplifying design and reducing cost. All this makes the sensor a versatile and practical choice for projects requiring reliable proximity detection. Features: Diffuse-reflective infrared proximity sensing (emitter and receiver housed in one module). Adjustable detection range from approximately 3 cm up to 80 cm via onboard potentiometer. Runs on standard 5 VDC supply, compatible with common microcontrollers (Arduino, etc.). Digital (NPN, Normally Open) output simple HIGH/LOW detection signal. Compact cylindrical plastic housing for easy mounting and integration. Low to moderate current consumption (< 100 mA) for efficient operation. Fast response time (< 2 ms) enabling prompt detection. Specifications: Parameter Value Model: E18-D80NK Sensing principle: Infrared diffuse-reflective photoelectric sensor Detection range: 3 cm – 80 cm (adjustable) Supply voltage: 5 VDC Current consumption: 25 mA (idle) up to ~100 mA load/output current. Output type: NPN, normally open (digital) Output load current: Up to ~100 mA. Response time: < 2 ms Housing material: Plastic, cylindrical threaded body (± Ø17–18 mm, length ~45 mm) Operating temperature: –25 °C to +55 °C Mechanical Dimension: Pin Functional Diagram:

From Micro Ohm's description

E18-D80NK Adjustable Infrared Sensor Switch 3-80cm The E18-D80NK Adjustable Infrared Sensor Switch 3-80cm is a set of transmitter and receiver in one of the photoelectric switch sensor. The detection distance can be adjusted according to the demand. The sensor has a detection range of 3-80cm. The Adjustable Infrared Sensor Switch is small, easy to use, inexpensive, easy to assemble and can be widely used in a robot to avoid obstacles, interactive media, industrial assembly lines, and many other occasions. The switching signal output differs in accordance with the obstacles. It remains high when no obstacles and remains low when there are obstacles. There is a bright light behind the probe to detect the scope of 3cm – 80cm. Connection Red wire: +5V Green wire: GND Yellow wire: Digital output OR Brown wire: +5V Blue wire: GND Black wire: Digital output. Features : Diffuse reflective type. Digital output. Adjustable detection distance. Low consumption. Compact size. Package Includes : 1 x E18-D80NK Adjustable Infrared Sensor Switch 3-80cm. Useful Links : How to interface with Adjustable Infrared Sensor Light source Infrared Sensing Range 3cm to 80cm Input Voltage (V) 5 Current Consumption 300mA Cable Length (Meter) 1 Shipment Weight 0.04 kg Shipment Dimensions 8 × 7 × 4 cm

From Ampere Electronics's description

E18-D80NK Infrared Photoelectric Switch Sensor E18-D80NK is a non-contact detection sensor providing a digital output when an object comes into a specific range of it. It is a low-cost, easy to assemble sensor with very little interference with the surrounding lights and environment. Features: Input Voltage: 5V Current Consumption: 25-100 mA Response time <2ms Sensor type: Diffuse reflective type Sensing range: 3-80 cm Cable length: 45 cm Applications Collision avoidance robots Machine automation Object detection Size: Diameter: 17MM Sensor length: 45MM Lead Length: 45CM Pin Configuration: VCC ( Brown ): Voltage input(+5V) GND ( Blue ): Ground terminal Signal ( Black ): Digital signal output Wiring and instructions Instructions Package Includes: 1x Proximity Sensor Related Products: SENSORS | MODULES