NodeMCU optical flash trigger

flash-trigger.ino

const int statusPin = LED_BUILTIN; // status LED pin
const int flashPin = D1; // flash pin
const int ldrPin = A0; // select the input pin for the LDR
//const int pwrPin = A3; // power pin
int sensorValue = 0; // variable to store the value coming from the LDR

void setup()
{
  pinMode(ldrPin,INPUT);
  pinMode(statusPin, OUTPUT);
  pinMode(flashPin, OUTPUT);
//  pinMode(pwrPin, OUTPUT);
}

void loop()
{
 // digitalWrite(pwrPin, HIGH);
  sensorValue = analogRead(ldrPin); // read the value from the LDR
  if(sensorValue > 500){ // you might need to adjust the default 950 value for optimal results
    digitalWrite(statusPin, LOW);
  //  digitalWrite(flashPin, HIGH);
    delay(10);
  } else {
    digitalWrite(statusPin, HIGH);
    digitalWrite(flashPin, LOW);
  }
}