board

common types

Through-beam type(对射型)

对射款 - 光电开关微型红光传感器

(pansonic shit-clone == Panasswinc)

Through-beam type(对射型) APPs

simple design of IR reflective

Retro-reflective type(反射板型)

Diffuse reflective type(漫反射型)

U-type Slot-type photoelectric sensor

  • common slot dimension 5 mm

working principles

  • Infrared (IR) sensor — detects reflected IR light
  • Ultrasonic sensor — measures sound wave echoes
  • LIDAR sensor — uses laser light to detect distance
  • Radar sensor — uses radio waves

fiber optic photoelectric sensor == Diffuse reflective type

alternative names

  • Obstacle detection sensor
  • Obstacle avoidance sensor
  • Proximity sensor
  • Distance sensor
  • Object detection sensor
  • Range sensor

common drive methods

NPN与PNP概念解读

NPN:表示共正电压,输出负电压; PNP:表示共负电压,输出正电压; NPN NO:表示常态下是常开的,检测到物体时黑色线输出一个负电压信号 NPN NC:表示常态下黑色线是输出负电压信号,检测到物体时,断开输出信号 PNP NO:表示常态下时常开的,检测到物体时黑色线输出一个正电压信号 PNP NC:表示常态下黑色线是输出正电压信号,检测到物体时,断开输出信号

DC NPN drive

DC ~24V PNP drive

ref