Multiple For Loops Running Simultaneously

Projects Programming
1

Hi Folks,

I'm Relatively new to Arduino.

I'm currently working with NeoPixel Strips. I'm using a For Loop to turn on LEDs.

I am trying to make it so as LEDs 0 to 4 will turn on one after the other at the same time as LEDs 5 to 10.

void loop() {
  for(int dot = 0; dot < 4; dot++){
      // Turn the first led red for 1 second
      leds[dot] = CRGB::Red; 
      FastLED.show();      
      // clear this led for the next time around the loop
      leds[dot] = CRGB::Black;
      delay(100);
      }

Is it possible to run another For Loop at the same time? Below is the For Loop required to light LED's 5 to 10

void loop() {
  for(int dot = 5; dot < 10; dot++){
      // Turn the first led red for 1 second
      leds[dot] = CRGB::Red; 
      FastLED.show();      
      // clear this led for the next time around the loop
      leds[dot] = CRGB::Black;
      delay(100);
      }

The goal is to have LED's 0 and 5 on at the same time followed by 1 and 6, 2 and 7 etc.

Any help on this would be greatly appreciated

2

I am trying to make it so as LEDs 0 to 4 will turn on one after the other at the same time as LEDs 5 to 10.

Well, you could do

      leds[dot] = CRGB::Red; 
      leds[dot + 5] = CRGB::Black;

Is it possible to run another For Loop at the same time?

No but there are smarter ways depending on your requirements

3

If you had more than 10 you could do nested loops

void loop() {

  for(int step = 0; dot < 5; dot++){ // 5 steps
      // a loop to select all the right leds
      for(int dot = step; dot < 10; dot+=5) {
          leds[dot] = CRGB::Red;
      }
      // display those for a short while
      FastLED.show();
      delay(100);

      // clear these led for the next time around the loop
      for(int dot = step; dot < 10; dot+=5) {
          leds[dot] = CRGB::Black;
      }
      FastLED.show();
      delay(100);   
   }
}