In referance to this post, I bought a relay to try.
I also got a DPDT Switch to replace the single master switch
Since the relay is a 5v, can I power it from the 5v arduino pin or do i really need a transistor to turn on the relay?
I have a tip120 and tip42 on hand, would they work?
Since I am turning a serial motor controller do I need a diode?
Found this diagram
How do I know which pins are - and + on the relay? Does it matter? The datasheet doesn’t say much.