Step-by-Step Guide: Interface 2 Channel Relay Channels With Arduino : 9 Steps - Instructables
5V 2-Channel Relay interface board, and each one needs 15-20mA Driver Current Indication LED's for Relay output status IN: can be high or low level
5PCS 2 Channel 5V Relay Module 10A with Optocoupler Low Level Trigger Expansion Board for Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR DSP Electronic
Arduino 2 Channel Relay : 3 Steps - Instructables
Lesson 68, Home Automation: How to control 16 Channel Relay module using Arduino control 16 AC loads
In-Depth: Interface Two Channel Relay Module with Arduino
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4pcs 5V One 1 Channel 1CH Low Level Trigger Relay Module interface Shield Board For Arduino PIC AVR DSP ARM MCU DC AC 220V : : Industrial & Scientific
Let's Learn: Controlling a 2 Channel Relay with Arduino
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