IR sensor with arduino and relay

Guide to IR Sensor- Pinout, Working & Arduino Project

Using IR Sensor (TCRT 5000) With Arduino

Arduino Tutorial - Controlling LEDS with LDR Sensor

How to Use an LDR Sensor With Arduino | Arduino

USING AN LDR SENSOR WITH ARDUINO

Programming Introduction with Arduino PLC IDE | Arduino Documentation

Sample code from Arduino video?

日常で使えるArduino 作品集。使い方とできることを回路やスケッチ付きで紹介します - ソロでたのしむ