1. Have to turn on or off, ac load using micro-controller. Microcontroller is +5V powered.
AC load is resisitive wire of 780ohms for heating wire purpose.

2. using MOC3052, I am sending high & low on its anode, but output load dont get on/off.

3. I am not using any zero cross here, I check when measured temperature is below setpoint just send +5V on MOC3052's anode & keep high until temperature is higher then setpoint then 0V on MOC3052's anode.

Is it due to this, that MOC3052 dont get turn on or off, as I am not using zero cross?

 

ckt

 

Put a 330 ohm resistor between MT1 and the Gate, that should keep your triac off until you turn on the LED in the isolator.

 

@DickCappels Do u mean between point L2 & Main2

 

No, I mean between the gate (G) and Main Terminal 1 (M1) which is connected to Neutral.

Edit:
I see there are many sets of terms and abbreviations for these three terminals. Please refer to the drawing below.

 

See here...