I want to control a lamp with my Arduino - usual stuff, I’ll have a PIR sensor and light sensor and it will come on if it is dark and someone passes it.
So I bought one of these relays.
To test it, I hooked up VCC to 5v on the Arduino, GND to Ground on the Arduino, and IN to Pin 2 on the Arduino.
I then used a simple sketch to switch Pin 2 Output between HIGH and LOW with 2 second intervals.
My expectation is that I would hear the relay click, but nothing. I can see the DS2 lamp on the relay light up and switch off every couple of seconds.
Do I need to put an actual load on the other side before the relay will click?
I know there is an optocoupler between both sides, so if I put my multimeter probe between common and NO or NC on the relay should I expect to see some voltage?
I’d rather not put the 120v through it until I know it is working.