Set led brightness and fade to set value without delay (PWM)

Projects Programming
1

Hey guys,

First of all, I want to say that I appreciate for taking from your personal time to answer to my question. Anyway here's the issue.

I want to a fade the led brightness to a set value without delay. This is code:

**'dim' is the actual led brightness
**'set_value ' is the brightness level set through serial
PS: The serial function has been omitted intentionally.

//////////////////////////

int fadeAmount = 1; // how many points to fade the LED by
unsigned long currentTime;
unsigned long loopTime;
int set_value = 115; // the brightness level set from serial
int dim = 0;

void setup()
{
currentTime = millis();
loopTime = currentTime;
}

void loop()
{
currentTime = millis();
if(currentTime >= (loopTime + 50))
{
if(set_value < dim)
{
fadeAmount = -fadeAmount;
dim+=fadeAmount;

}
if(set_value > dim)
{
fadeAmount = 1;
dim+=fadeAmount;
}
loopTime = currentTime; // Updates loopTime
}
}

/////////////////////////

What am I doing wrong? :astonished:

2

Try ...

if (set_value <  dim)
{
    dim -= fadeAmount;
}
if (set_value >  dim)
{
    dim += fadeAmount;
}

The code would be a bit easier to understand if you used a better name for dim. Maybe currentLEDValue.

And please use code tags when you post code :slight_smile: (the "#" button above the row of smileys).

Regards

Ray

3

Thanks for the tip... I'm kinda new to this forum. :~ I'll do that next time.
Regarding the code, I'll try that.

4

Take look at blink without delay and look and how the timing is handled there.

Mark

5

Thank you Mark and Ray. You've been very helpful.
I figured it out!
XD