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First I controlled it with an arduino and here's the software for that.  I also controlled it from an ESP8266 module.

In this program I skip every 2nd zero cross detection and just wait out a poredetermined amount of time to fire it again.  This seemed to work better but I'll certainly need to revisit this in the future when I make a "real" version of this (which would include a varistor and fuse for safety and protection)

 
#define ZERO            2
#define GATE            3
 
#define GATE_DELAY      9
 
/* range 0 - 255 : 0 = off    255 = on */
volatile uint8_t  dim = 127;
volatile uint8_t skip = 0;
void setup() {

  pinMode(ZERO, INPUT_PULLUP);
  pinMode(GATE, OUTPUT);
 
  attachInterrupt(digitalPinToInterrupt(ZERO), dimmer, RISING);
 
  Serial.begin(9600);

}
 
void loop() {
  /* dim test */
  int i=0;
  for (;i < 256; i++){
    dim = i;
    delay(100);
    Serial.print("dim value: ");
    Serial.println(i);
   }
   for (;i >= 0; i--){
    dim = i;
    delay(100);
    Serial.print("dim value: ");
    Serial.println(i);
   }
}


void dimmer() {

  if (skip == 0){

      dim = 180;

    /* (1000ms / 120hz) = 8.33 */
    float waitMillis = (8.33 / 255) * (255 - dim);

    uint16_t waitMicros = (uint16_t)(waitMillis * (float)1000);
 
    delayMicroseconds(waitMicros);
 
    digitalWrite(GATE, HIGH);
    delayMicroseconds(GATE_DELAY);
    digitalWrite(GATE, LOW);

    delayMicroseconds(8330 - GATE_DELAY);
 
    digitalWrite(GATE, HIGH);

    delayMicroseconds(GATE_DELAY);
    digitalWrite(GATE, LOW);
  
    skip = 1;
  
  } else {

    skip = 0;

  }
  
}

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