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problem with ac dimmer circuit with nRF51822

hi,

i tried to make a ac dimmer circuit controlled with dc

i use nrf51822

this is my dimmer circuit

image description

aaand this one is zero crossing detector

image description

finally this is my mbed code;

DigitalOut trigger(p15);

DigitalIn zero(p14);

int main()

{

    while(1)  

    {

        if (zero==1) 

        {

            wait_us (5000);  
                
            trigger = 1;      
             
            wait_us (100);  

            trigger = 0;     

        } 

    }

}

i just want to dim my light %50, but it always blinking.

can anyone help me and tell me what is my mistake?

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