4 Pin RGB LED Flickering Flame effect, help!

Other Hardware LEDs and Multiplexing
1

Hey guys this is my first post on here (go easy), I'm trying to make a flickering LED effect using a 4pin LED, I know normal LED flame tutorials have been done to death but I can't seem to find one for 4pins, I'm using these ones because in my experience theyre a lot brighter. So! Out of curiosity I tried this code with the LED, it works in terms of flickering, but it goes all different colours as opposed to going traditional red/yellow. I've got another 2 of these LED's if its a case of setting them individually to a colour then getting them to flicker. Can anyone point me in the right direction? Any help is appreciated! Thanks

int ledPin1 = 10;
int ledPin2 = 9;
int ledPin3 = 11;

void setup()
{
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
}

void loop() {
analogWrite(ledPin1, random(120)+135);
analogWrite(ledPin2, random(120)+135);
analogWrite(ledPin3, random(120)+135);
delay(random(100));
}
2

To keep the light in the Red/Orange/Yellow range you probably want to make sure that the Green and Blue components are the same intensity:

int ledPinRed = 10;
int ledPinGreen = 9;
int ledPinBlue = 11;

void setup()
{
pinMode(ledPinRed, OUTPUT);
pinMode(ledPinGreen, OUTPUT);
pinMode(ledPinBlue, OUTPUT);
}

void loop() {
int Red = random(120)+135;
int Yellow = random(120)+135;
analogWrite(ledPinRed, Red);
analogWrite(ledPinGreen, Yellow);
analogWrite(ledPinBlue, Yellow);
delay(random(100));
}
3

johnwasser:
To keep the light in the Red/Orange/Yellow range you probably want to make sure that the Green and Blue components are the same intensity:

Unfortunately, green and blue do not mix to give yellow, that gives cyan. You need to mix red and green to get yellow. Try selecting a random red level, then a random green level that is no greater than the red level you picked. Either don't use blue at all, or use a random blue level that is no greater than the green level you picked.

4

I would not flash the blue one at all and limit the range of the green LED to keep all he colours flame like.

5

Ah thanks so much guys! The code johnwasser gave worked a treat! It now flickers red/yellow :slight_smile: