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if(mode == 8) {
    //analogWrite(rtrigPinout, 255);
    digitalWrite(rtrigPinout, HIGH);

    ltrigValue = analogRead(ltrigPin);
    // if ltrigValue is more than half
    if (ltrigValue < 655) {
        knobValue = analogRead(knobPin); //get the delay setting from the knob
        //lets change the 1/5 to 1/4 or 1/8
        knobDiv = knobValue>>2;  //knobDiv = knobValue/4
        digitalWrite(ltrigPinout, HIGH);
        unsinged int i = 0x0;
        delay(40);
        for(i=0;i<=knobValue;i=i+knobDiv){//0,1/4,1/2,3/4,1 == 5 times
            delay(knobValue);
            ltrigValue = analogRead(ltrigPin);
            //should define a threshold rather than chose < 1
            //in the case there is some noise on the trigger line
            //#define THRESH 10
            if(analogRead(ltrigPin)){
                break;
            }
        }
        digitalWrite(ltrigPinout,LOW);
    }
}