http://www.amazon.in/Channel-Module-Optical-Isolation-Arduino/dp/B01EE3N4F6?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=21a1651c-52ad-4e81-a27c-4a3e1bf72c76 I bought it from the above link. No, I wanted to know whether the 5 V GPIO pin will provide power to my relay so that I can use it to...