How do I Sequence through a string of NeoPixels

[seanmc2]

I seem to be missing something in my understanding on how to turn on and off a sequence of NeoPixels. What I want to do (first part of the code included below) is to turn on several NeoPixels in a strip (code attached), sequentially, and them turn them back off again in sequence.

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#include <Adafruit_NeoPixel.h>
#define PIN 6

// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(1, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}

void loop(){
  strip.show();
for (int pNum = 0; pNum<60; pNum++){
  strip.setPixelColor(pNum, 0,0, 64);
  strip.show();
  delay(1000);
  
  strip.setPixelColor(0,0,0,64);
  delay(500);
  
  strip.setPixelColor(1,0,0,64);
  delay(500);
  strip.show();
  strip.setPixelColor(2,0,0,64);
  delay(500);
    strip.show();
  strip.setPixelColor(3,0,0,64);
  delay(100);
    strip.show();
  strip.setPixelColor(4,0,0,64);
  delay(500);
    strip.show();
  strip.setPixelColor(5,0,0,64);
  delay(500);
    strip.show();
} // end for loop
}// end loop

[adafruit_support_bill]

please use the </> button when submitting code. press </>, then paste your code between the

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tags.

All of your setPixelColor commands are setting the pixels to the same color blue : R=0, G=0 and B=64. To turn a pixel off, the color should be 0,0,0.

[seanmc2]

I understand that setting a color argument to 0 turns the device off. My problem is that they don't get turned on in sequence... only one LED come on.

If I loop through them,

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void loop(){
 strip.setPixelColor(0,0,0,64);
  delay(500);
   strip.show();

 strip.setPixelColor(1,0,0,64);
  delay(500);
   strip.show();

 strip.setPixelColor(2,0,0,64);
  delay(500);
   strip.show();

}

Shouldn't this turn the thee NeoPIxels (0,1, &2 ) in sequence with a 500ms delay between?

[adafruit_support_bill]

It should. Have you tested that your strip works with the strandtest example?

[chemdoc77]

Hi Seanmc2:

In your code you have:

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Adafruit_NeoPixel strip = Adafruit_NeoPixel(1, PIN, NEO_GRB + NEO_KHZ800);

The number “1” refers to how many NeoPixels you are using. If you are using three NeoPixels as in your last post, you need to have the following:

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Adafruit_NeoPixel strip = Adafruit_NeoPixel(3, PIN, NEO_GRB + NEO_KHZ800);

If the strip is larger and has 60 NeoPixels then change the "3" to "60".

Best Regards,
Chemdoc77

[seanmc2]

Chemdoc77,

Thanks!! That did the trick. I'm not surprised that it was something so simple... duh!! LOL... thanks again.