arduino + optotriac based ac dimmer blinking severely

The light is simply blinking instead of dimming. So I used the following software to just glow the bulb without dimming: unsigned int i=1; void setup() { Serial. begin(9600); pinMode(AC_pin, OUTPUT); pinMode(11, OUTPUT); attachInterrupt(0, light, RISING); } void light(){ i+; digitalWrite(11, LOW); delayMicroseconds(10); digitalWrite(11, HIGH); } void loop(){ if(i%100=0){ Serial. println(`100`); i=1; } }
arduino + optotriac based ac dimmer blinking severely - schematic

Following are the results: In the above code I am testing the zero crossing circuit just by counting upto 100, and printing a value (100) when it turns hundred. When i run the system without load (pin 11 is not connected to opto triac) it gives me almost perfect print rate of 1 per second (visibly) and steady. Now if i connect pin 11 to opto triac 3021, the output load bulb starts blinking (not steady at all), and also the output of optocoupler (4n25) gets randomized; Visibily i can see it is not giving output at every 1 second, rather it is somewhat random. Please note instead of MOC3021 i am using EL3021, and in place of TIC206 triac i used bt 136. I am not using any snubber right now. I also tried the software from. Still with no luck however their schematic is little bit different in terms of biasing but i am using exact values from the schematic attached. Please help me sorting out this problem.

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