Static White Pattern

Patterns and Code
1

Hi All,

Total newb here… I just swapped in my new V3 for my V2 that stopped responding. I had a pattern I cant seem to recreate. It was 5 LEDs on in white every 20 across my strip of 450. No motion just static white.

Any help would be appreciated!

Thanks,
Jon

2

No prob. I’m assuming you’re not looking to be taught how to fish here.

This should get it done for you.

var offset = 0 // How far to start from the left
var onCount = 5
var every = 20

export function render(index) {
  on = mod(index - offset, every) < onCount
  hsv(0, 0, on)
}

// You only need this on PB v2
function mod(dividend, divisor) {
  var res = dividend % divisor
  if ((res != 0) && (res > 0) != (divisor > 0)) { //this compares the sign of both
    res += divisor
  }
  return res
}

Edit: The guy who asked for a builtin mod() (me) forgot to use it correctly :expressionless: Now it’s fixed in the above, with Wizard’s mod polyfill for v2 users.

3 Likes
3

Thank Jeff, this community and product is awesome! This makes perfect sense. i edited the below and got close, but not really sure why it worked and i know its not correct. your example i actually understand, thank you!

/*
Color fade pulse

Pulses travel slowly to the left, while colors travel quickly to the right.
Pulses change how colorful they are slowly, close to the pulse moving speed.
*/

export function beforeRender(delta) {
t1 = time(0) // For hue movement
t2 = time(0) // For pulse movement
t3 = time(0) // White / desaturation movement
}

export function render(index) {
// When you see a function using time as a - t1 phase shift, this is moving
// to the right.
h = index / pixelCount * 2 - t1

/*
This creates the pulses themselves. A + t2 indicates these will be moving
to the left. The * 4 makes them more frequent in the strip. In fact, you
an think of this as “having 4 pulses visible at any given time.”
*/
v = triangle(index / pixelCount * 25 + t2)
v = v * v * v * v

// Every few pulses will be whiter (low saturation). Each pulse will very
// slowly alternate between a whitish pulse and deeper saturated hues.
s = wave(index / pixelCount / 2 + t3)

hsv(h, 0, v)
}

1 Like
4

Absolutely love that you gave it a shot. I’d rather mentor than just provide code, but it’s nice to just get a project done sometimes and be able to learn more later.

1 Like
5

Hi Jeff, i always like to learn! I just didnt have a starting point for static patterns. this is fantastic and i can certainly run with this and begin my journey!

Thank you again for the quick help!

Regards,
Jon