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Works for me with an arduino in the following way: hook up + to 5V, - to GND, and S to 13. Then run the basic arduino blink program to hear the relay click on and off every second. Setting pin 13 to HIGH flips the relay. Also still flips the relay if the pin is protected with a 220 ohm resistor, though I'm unsure if that protection is needed.
Great little relay. Easy to hook up and versatile. Used it for closet light hooked to magnetic switch circuit to turn on 120 VAC light when door opens.
This worked five except the NC screw wouldn't tighten, meaning the write constantly comes out. This makes it useless for my current purpose, but if I need a NC I will be able to use it...I think.
Works really well. Switching my gecko's 120V heat lamp on and off with an arduino to maintain temperature, been performing for a month now and all good. Love how the stakes were already soldered on, just wire it and good to go.