While Loop Help

Projects Programming
1

Looking for some help with my simple program. Just getting started and trying to have a while loop increment and the delay to decrease while blinking an LED. My first counter works fine but I cannot get the led delays to get smaller as it increments. Anyone with any thoughts?

int counter = 0;
int increment_delay = 1000;
int speed_increase = 100;

void setup()
{
pinMode(13, OUTPUT);
}

void loop ()
{
while (counter < 15)
{
digitalWrite(13, HIGH);
delay(increment_delay - speed_increase);
digitalWrite(13, LOW);
delay(increment_delay - speed_increase);
counter++;
speed_increase + 100;
}
}

2

The variable "speed_increase" is never modified.

You have:
speed_increase + 100;

Which actually does nothing.

You want
speed_increase = speed_increase + 100;
or
speed_increase += 100;

The problem THEN will be that once speed_increase is over 1000 the subtraction will result in a negative value. You're going to want to rethink that.

3

You got me on the right track,

ended up with something like:

int counter = 0;
//int delay = 1000;
int speed_increase = 1000;

void setup() 
{
pinMode(13, OUTPUT);
}

void loop () 
{
  while (counter < 30)
  {
    digitalWrite(13, HIGH);
    delay(speed_increase);
    digitalWrite(13, LOW);
    delay(speed_increase);
    counter++;
    speed_increase = speed_increase - 33;
  }
}
4

Nailed it!

I like the way you calculated the minimum possible delay to be 10 ms. Good math skills.

5 
    speed_increase = speed_increase - 33;

Strange name for a variable that only decreases in value...