Is it possible to operate the grove relay as a switch, that direct control with no programming
Not exactly clear on what you’re asking but I think it’s a yes. A relay is a very simple device. You don’t need to program it.
I want to use the relay simply as a switch to operate other devices. The relay i have is a HLS8L DC3V S C and has 4 income pins so I assume i only need too use the power and earth pins. The relay therefore should only activate when I apply power.
+5v to pin 3, ground to pin 4, the relay will switch if you apply +3v to pin 1.