Different lightning effects using Neopixel

Other Hardware LEDs and Multiplexing
1

Hi Guys!

I have a Neopixel ring with my arduino and I want to cycle different color effects in one loop {}.
The lightning 2 effects should be:

  1. one leds after another should go on red (it should start in the middle of the Neopixel ring and cycle in both direction till the ring is full)and then in the reverse direction it should light blue

This effect works without problems.

  1. the second lightning effect should be a normal rainbow cycle

BUT after the first lightning effect my arduino stops and the rainbow cycle never comes up.
Maybe someone of you can see my fault in the program code:

#include <Adafruit_NeoPixel.h>


#define RINGPIN 6


uint8_t NUMPIXELS = 24;     // total number of LED's in the ring display

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMPIXELS, RINGPIN, NEO_GRB + NEO_KHZ800);  // an instance for the LED ring display

void setup() {
  // put your setup code here, to run once:
  strip.begin();
  Serial.begin(9600);
}

void loop() {

  //Ascend strip
  for (int i = NUMPIXELS / 2; i >= 0; i--) {
    //for (int i = 0; i < (NUMPIXELS / 2) + 1; i++) {
    strip.setPixelColor(i, strip.Color(255, 0, 0));
    strip.setPixelColor(NUMPIXELS - i, strip.Color(255, 0, 0));
    strip.show();
    delay(50);
  }

  // Descend Strip
  for (int i = 0 ; i >= 0; i++) {
    //for (int i = 0; i < (NUMPIXELS / 2) + 1; i++) {
    strip.setPixelColor(i, strip.Color(0, 0, 255));
    strip.setPixelColor(NUMPIXELS - i, strip.Color(0, 0, 255));
    strip.show();
    delay(50);
  }
  rainbowCycle(20);
}

void rainbowCycle(int SpeedDelay) 
{
  byte *c;
  uint16_t i, j;

  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
    for(i=0; i< NUMPIXELS; i++) {
      c=Wheel(((i * 256 / NUMPIXELS) + j) & 255);
      strip.setPixelColor(i, *c, *(c+1), *(c+2));
    }
    strip.show();
    delay(SpeedDelay);
  }
}

byte * Wheel(byte WheelPos) {
  static byte c[3];
 
  if(WheelPos < 85) {
   c[0]=WheelPos * 3;
   c[1]=255 - WheelPos * 3;
   c[2]=0;
  } else if(WheelPos < 170) {
   WheelPos -= 85;
   c[0]=255 - WheelPos * 3;
   c[1]=0;
   c[2]=WheelPos * 3;
  } else {
   WheelPos -= 170;
   c[0]=0;
   c[1]=WheelPos * 3;
   c[2]=255 - WheelPos * 3;
  }

  return c;
}

Many thanks in advance!
Greetings Julian

Moderator note : table tags changed to code tags - OP please use them in future

2

Here:

for (int i = 0 ; i >= 0; i++)

This loop will run for a long time (until i rolls over from 32767 to -32768, so more than 27 hours). Check the condition which continues/stops the loop.

3

Woderful! Now it works! Thank you very much! :slight_smile:

4

modit:
hank you very much! :slight_smile:

Great! You might want to post the corrected version for the benefit of others with similar problems in future.