RobotDyn zero-cross detector

Using Arduino Project Guidance
1

I've purchased a RobotDyn zero-cross detector, which I suspect is defective. Before I toss it (and $10), I want to check my testing procedure and make sure I'm not just thinking about this wrong.

My wiring is: AC power cord .> AC-IN, 110V lamp -> LOAD, Uno 5V -> VCC (I've also tried Uno 3.3V with same results), Uno gnd -> GND, Uno D2 -> Z-C (unused in my test sketch), Uno D3 -> PWM

My sketch is:

int AC_LOAD = 3;  

void setup()
{
   pinMode(AC_LOAD, OUTPUT);
}

void loop()  {
   digitalWrite(AC_LOAD, HIGH);   
   delay(1000);
   digitalWrite(AC_LOAD, LOW);   
   delay(1000);
}

I expect the 110V lamp to blink off and on. What I'm seeing is the blue LED on the RobotDyn board blink off and on, but the 110V lamp is steady on at full brightness. Help?

2

My wiring is:

Not understandable from the words description, try a schematic, hand drawn is fine.

Pleas post a link to this “zero crossing detector” because what ever it is called it is not that. That might be an adjunct to what it is but you can’t turn a mains light on and off using a zero crossing detector.