Product Description

E18-D80NK is a photoelectric sensor with diffuse reflection and an adjustable sensing distance of 3–80 cm, ideal for Arduino/DIY projects, conveyor belts, part counting, or non-contact presence/position detection. The adjustment is made via the built-in potentiometer, and the status LED quickly confirms triggering.

The sensor provides an NPN (open-collector), Normally Open (NO) output, easy to integrate both with microcontrollers and low-voltage automation circuits.

Performance varies with the target’s color and reflectivity—light/reflective surfaces are detected from a greater distance than dark/matte ones.

Technical Details

• Model: E18-D80NK
• Type: photoelectric, diffuse reflection
• Sensing distance: adjustable ~3–80 cm (depending on target and adjustment)
• Supply: 5 VDC (common in microcontroller projects)
• Output type: NPN / NO (open collector)
• Max output current: up to 100–300 mA (depending on version; recommended to use as a logic signal or with a load resistor)
• Indicators: Power LED and Detection LED
• Connector/pins: VCC (5 V), GND, OUT
• Notes: OUT logic is usually active LOW (OUT → GND on detection); set the threshold with the potentiometer for the desired target

Sample Schematic and Code (Arduino)

Purpose: read the sensor’s NPN output at 5 V.

Connections:

• VCC → +5 V Arduino
• GND → Arduino GND
• OUT → Arduino digital pin D2
  In software, enable the internal pull-up resistor. When the object is detected, the output pulls the line to ground ⇒ we read LOW.

// E18-D80NK – read on D2 with internal pull-up

const int SENSOR_PIN = 2;

void setup() {

  pinMode(SENSOR_PIN, INPUT_PULLUP);  // enable 5V pull-up

  Serial.begin(115200);

}

void loop() {

  bool object_detected = (digitalRead(SENSOR_PIN) == LOW); // LOW = active

  if (object_detected) {

    Serial.println("Object detected!");

  }

  delay(50);

}

Best-practice recommendation: if you drive a load (relay, motor), use a separate transistor/driver or a relay module, and for electrical isolation use an optocoupler (e.g., PC817) between the sensor and the microcontroller.

Package Contents

• 1× E18-D80NK photoelectric sensor (NPN, NO), 3–80 cm, 5 V