Introduction

This is a reflective sensor contains two infrared service, there is a nameplate write ST188, look at it, and two pins from the left are the VCC and GND belong to the infrared receiver, the rest of two pins belong to the infrared emitter are VCC and GND, the one at the rightmost tip is VCC. The infrared emitter transmits the infrared and the infrared will be reflected by the obstacle, then the infrared receiver got the infrared, the receiver also the transistor will break over.

Resource

Program