AStasauskasWrote 3141 days ago.This is a great and cheap relay module. You can connect it to arduino and switch it on/off by supplying
- or + voltage (depending on the LO/HI setting). And it connects COM with NO or NC depending on the LO/HI jumper setting.
Might be a bit noisy for quiet environments, so I suggest putting it into a foam soundproof box if want to use it quietly.