void setup() {
  pinMode(PA6, OUTPUT);
  pinMode(PA1, INPUT);

  // LDR: 0 to 1023
  analogReadResolution(10);
}

void loop() {
  int lightLevel = analogRead(A0);
  int motion = digitalRead(PA1);

  // BRIGHT → OFF
  if (lightLevel <= 500) {
    analogWrite(PA6, 0);
  }

  // DARK
  else {

    // Motion detected → FULL brightness
    if (motion == HIGH) {
      analogWrite(PA6, 255);
    }

    // No motion → DIM brightness
    else {
      analogWrite(PA6, 30);
    }
  }

  delay(100);
}