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Lesson 68: Controlling a 16-Channel Relay with an Arduino UNO or MEGA

In this lesson, we learn about relays and how to use a 16-channel relay with an Arduino UNO or Arduino Mega. The wiring of a relay module is shown, and the code is explained.

This module has a problem with voltage to the relay. See my video showing you how to solve the problem.

How to use this relay with just four wires, or see how to control more than one relay at a time in the 16-channel relay module.