Hello everyone! I'm working on a sound installation in which I´ll be using a relay to switch through 12 active speakers (Computer speakers). I have an arduino due, a sainsmart 16ch relay and the 12 speakers. I have never use relays before and I am a bit confuse as to how the hook up will be.
I did some attempts last night but:
I connected the sainsmart to a 12V power supply and the Due to the computer. Then from the Due I connected pins 2, 3 and ground to the relay. It wasn't switching until I connected the 3.3V from the Due to the 5V on the sainsmart. It works but I'm not so sure that's correct, the heating up of the Due re affirming my suspicions.
I disconnected the Due from the computer, but kept the rest of connections... It kind of works, the LEDs on the sainsmart switching. I'm just not sure it is doing it correctly.
I have on idea on how to connect things to make it sound. Plan is to take the stereo out from the computer and have the relay switch which speakers will play the audio. Any help will be much appreciated, I don't want to break things and I'm feeling very insecure about this project.
Thank you so much for your help!