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Control up to 65,280 relays with your arduino! .
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Arduino 5V relay module KY-019 - Steps2Make

Arduino Relay Module Tutorial | Microcontroller Tutorials

Guide for Relay Module with Arduino | Random Nerd Tutorials

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5 Volt 4 Channel Arduino Relay Module example - Arduino Learning

Arduino - Circuit Basics

Control Up to 65,280 Relays with Your Arduino! - Hackster.io