Trying to move arrays of LEDS on 2812

[jhtoolman2000]

Hi guys,

So I'm trying to move this array of leds on a LED strip. I have 162 leds on my 2812 strip. Below is a snippet of my code. The code lights up 4 groups of 5 LEDS on the strip. What I'm wanting to do is move them all to the left 10 spots and all to the right 10 spots simutaneosly. I don't know where to start. Been scouring online and the forum and am lost. Any advice? Thanks!

int myBases[ ] = {14,15,16,17,18,  60,61,62,63,64,  97,98,99,100,101,  143,144,145,146,147};      //address of LED's to be passed into the for loop
int b;

........
{
    TouchThemAll();
  }


void TouchThemAll()
{
 FastLED.clear();
Bases();
}
void Bases() {

  for (b = 0; b < 20; b++)  //To me this says, turn every led on at led[i address]
  {
    leds[myBases[b]] = CRGB::White;
   
  }
FastLED.show();
}

[guix]

Hello

leds[myBases[b] + n], where n is your shift position ( -10 to 10 )

[jhtoolman2000]

Thanks for the reply guix!
So I would (+ n) then the same line after with (-n) to get the arrays of LEDs to move left then right? Sounds easy!

[jhtoolman2000]

So here is my complete sketch. I'm not able to get the arrays of leds to simultaneosly shift over 4 spots then back. to the original position.
When its loaded to the arduino, the leds light up 4 spots over from their array position. What I'm wanting is an animation for them all to shift over 4 spots then back and repeat. Sorry I wasn't more clear....Any suggestions?

#include "FastLED.h"

#define NUM_LEDS 50

#define DATA_PIN 5
//#define CLOCK_PIN 13


int myBases[ ] = {7,8,9,10,  17,18,19,20,  28,29,30,31,  39,40,41,42};      //address of LED's to be passed into the for loop
int b;
#define n 4

CRGB leds[NUM_LEDS];

void setup() 
{     
       FastLED.addLeds<WS2812, DATA_PIN, RGB>(leds, NUM_LEDS);
}

void loop() 
{
TouchThemAll();
}

void TouchThemAll()
{
 FastLED.clear();
Bases();
}
void Bases() {

 
  for (b = 0; b < 16; b++)  //To me this says, turn every led on at led[i address]
  {
    leds[myBases[b]+n] = CRGB::White;
    delay(20);
    leds[myBases[b]-n] = CRGB::White;
    delay(20);
  }
  
FastLED.show();
}

[guix]

Not that easy, but not much harder

Here is an example : t938915.ino - Wokwi Arduino and ESP32 Simulator

[jhtoolman2000]

Guix!
THANK YOU! I believe I can extrapolate what I need out of your sketch. Thank you for your guidance. Much appreciated!

[guix]

Glad it helped

I have simplified the previous example

But if you wanted to move directly to target position and not one pixel at a time, here is another example using a simpler method : t938915_2.ino - Wokwi Arduino and ESP32 Simulator

Note that in my examples I never check if the leds array indices are valid, so in your code make sure to add protection to never read or write outside of the leds array

[jhtoolman2000]

GUIX: Thanks again man! One last question: if i just wanted to run the sequence say 5 times for example, would it look something like this below? Sorry not in front of my setup at the moment so I'm thinking out loud...

{
  #define NUM_PATTERN1 5

---------

for (int i = 0; i < NUM_PATTERN1; i++) {
    pattern1();
  }
  
void pattern1()

//your code:
    for ( uint8_t i = 0; i < basesCount; i++ )
      {
        for ( uint8_t j = basesStart[i], k = j + basesLength; j < k; j++ )
        {
          leds[j] = CRGB::White;
        }
  }