The E18-D80NK is a popular, low-cost adjustable infrared (IR) proximity sensor used for obstacle avoidance and object detection in robotics and industrial automation. It integrates both an IR transmitter and a receiver into a single compact, threaded cylindrical chassis.Key Specifications

• Operating Voltage: 5V DC
• Current Consumption: < 25mA (static), up to 100mA when triggered
• Sensing Range: Adjustable from 3 cm to 80 cm via a rear potentiometer
• Output Type: NPN Normally Open (NO) Digital Output
• Output Signal Status: HIGH (5V) by default when clear; LOW (0V) when an object is detected
• Immunity: Emits a modulated IR beam, shielding it against false triggers from ambient light

Wiring PinoutThe sensor comes with an attached 3-wire cable:

• Brown Wire: Connect to 5V VCC
• Blue Wire: Connect to GND (Ground)
• Black Wire: Digital Signal Output (Note: Many microcontrollers require enabling an internal pull-up resistor or adding an external 10k pull-up resistor between the Brown and Black wires to read a clean HIGH status).