I’m not sure whether I’ve wired this up wrong or if I have a defective board.
I’ve connected VCC to +5v on Arduino, GND to GND on Arduino, and the K1 (control for 1st relay) to pin 13, and have that cycling between high and low every second, but I don’t hear any clicking.
I’ve also tried testing it out with another 9v circuit, and for some reason the ground on the terminal blocks seems to be connected to GND on the Arduino(!), although again I might just be doing it on.
Also, could someone please explain what NO, COM and NC means on the terminal blocks? Thanks.