#define trigPin D5
#define echoPin D6

void setup() {
  pinMode(D10, OUTPUT);
  Serial.begin (115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;

    Serial.print(distance);
    Serial.println(" cm");



    if (distance < 100)
{
  // actie A
  Serial.println("Lichtje aan");
  digitalWrite(D10,LOW);
}
else
{
  // actie B
  Serial.println("Lichtje uit");
  digitalWrite(D10,HIGH);
}


  delay(500);
}