can't turn LED off on pin 13

Projects Programming
1

I'm writing up a basic program to read a random analogue value and use it as seed for a delay factor before turning an LED on, I thought I'd use the built in LED on pin 13 but I won't go out even if I comment out the code turning it on and it is turned off manually in there setup part of the code.

unsigned int seed, D;


void setup() {

  digitalWrite(13, LOW);
}

void loop() {

  seed = analogRead(0);
  D = seed * 100;
  if ((D > 5000) && (D < 60000)){
    delay(D);
   // digitalWrite(13, HIGH);
  }
}
2

I see that once the led is turned on, never turns off, you don't have a digitalWrite (13, LOW) in any point of the loop() function, so it never turns off. It turns on once after the delay() and keeps on ever and ever.

3

Your code turns the LED off for me at startup.
But setup() was changed to this so when the LED came on it would glow full brightness.

void setup() {
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);
}
4

oh i see the pin still needs setting as an output

5

sparkylabs:
oh i see the pin still needs setting as an output

Yes, I did'nt realize!!