Merry Christmas! I believe many of us know what a relay is. I have a small relay at home. I bought it few years back, I know how to use it, but I never actually tried to make (assemble) one myself until 3 days ago and after some trial and error I was able to get my solution. So this instructable is not only on how to use an already assembled relay module but also on how to assemble yours as well using a breadboard or printed circuit board (PCB).
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Step 1: Part Selection
5. Two Resistors ( recommended 1k ohm and 220 ohm).
6. NPN transistor ( recommended BC639).
Step 2: Connection.
I don't think I have to say much about the connection. since the image shows everything. usually when browse google the connection is not setup in this manner. The images I saw on Google made it wee bit difficult for me to understand. That is why I am setting up my diagram this way for those who think like me.I hope this can help anyone looking to setup a relay module. Thank you until next time. Bye.