#define trigger_pin 18
#define fire_pin 9

void setup()
{
  Serial.begin(115200);
  pinMode(trigger_pin, INPUT_PULLUP);
  pinMode(fire_pin, OUTPUT);
  digitalWrite(fire_pin, LOW);
}
void loop()
{

  if (!digitalRead(trigger_pin))
  {
    delay(10);
    if (!digitalRead(trigger_pin))
    {
      digitalWrite(fire_pin, HIGH);
      delay(50);
      digitalWrite(fire_pin, LOW);
    }
  }
}