FastLED Thinks Three Light Strips Are One Big One

Other Hardware LEDs and Multiplexing
1

I have 3 seperate light strips each wired to their own output pin on the Arduino. I tried this simple built in temperature function within FastLED "candle" to set all of the strips to the same warm hue. They all show varying hues of orange/red as if FastLED is thinking that all 3 LED strips are actually 1 long strip consisting of 864 Leds instead of 3 strips, 288 a piece. How can I get all 3 strips to show the same thing?

#include "FastLED.h"

#define NUM_LEDS    288
#define CHIPSET     WS2813
#define COLOR_ORDER GRB
#define BRIGHTNESS  200

#define LED_PIN_1 9     // Pin number for the first strip
#define LED_PIN_2 10    // Pin number for the second strip
#define LED_PIN_3 11    // Pin number for the third strip

#define TEMPERATURE_1 Candle

CRGB leds_1[NUM_LEDS];
CRGB leds_2[NUM_LEDS];
CRGB leds_3[NUM_LEDS];

void setup() {
  Serial.begin(9600);
  delay(1000);

  FastLED.addLeds<WS2812, LED_PIN_1, GRB>(leds_1, NUM_LEDS);
  FastLED.addLeds<WS2812, LED_PIN_2, GRB>(leds_2, NUM_LEDS);
  FastLED.addLeds<WS2812, LED_PIN_3, GRB>(leds_3, NUM_LEDS);

  FastLED.setCorrection( TypicalSMD5050 );
  FastLED.setBrightness(BRIGHTNESS);
}

void loop() {
  // Set the color temperature for each strip
  for (int i = 0; i < NUM_LEDS; i++) {
    FastLED.setTemperature( TEMPERATURE_1);
    leds_1[i] = TEMPERATURE_1;
    leds_2[i] = TEMPERATURE_1;
    leds_3[i] = TEMPERATURE_1;
  }

  FastLED.show();   // Update all LED strips
  delay(100);       // Delay between updates (adjust as needed)
}
2

Which Arduino?

3

Arduino Mega 2560 Rev 3

4

nonsense
you write same correction to whole each strip, so they are identical, just like you expect

you would save 2/3 used memory if connect strips to one pin.

5

They are NOT identical and that is the problem. I believe the FastLED “candle” color is a soft gradient from light yellow to red. One of my strips is light yellow, the next is yellow orange and the third strip is orange red. That is the issue. I cannot figure out what to change in the code to make all 3 strips show the same gradient, not the entire gradient spread across the 3 strips.

I would also like to avoid connecting all 3 strips to the same signal pin on the Arduino for future projects.

6

is not a color but colorTemperature.

7 
#include "FastLED.h"

#define NUM_LEDS    288
#define BRIGHTNESS  200

#define LED_PIN_1 9     // Pin number for the first strip
#define LED_PIN_2 10    // Pin number for the second strip
#define LED_PIN_3 11    // Pin number for the third strip

uint32_t ColorPallete[] = {CRGB::Red, CRGB::Orange, CRGB::Yellow, CRGB::LightYellow };

CRGB leds_1[NUM_LEDS];
CRGB leds_2[NUM_LEDS];
CRGB leds_3[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812, LED_PIN_1, GRB>(leds_1, NUM_LEDS);
  FastLED.addLeds<WS2812, LED_PIN_2, GRB>(leds_2, NUM_LEDS);
  FastLED.addLeds<WS2812, LED_PIN_3, GRB>(leds_3, NUM_LEDS);

  FastLED.setCorrection( TypicalSMD5050 );
  FastLED.setBrightness(BRIGHTNESS);
}

void loop() {
  // Set the color temperature for each strip
  for (int i = 0; i < NUM_LEDS; i++) {
    byte Index = random(4);
    leds_1[i] = ColorPallete[Index];
    leds_2[i] = ColorPallete[Index];
    leds_3[i] = ColorPallete[Index];
  }

  FastLED.show();   // Update all LED strips
  delay(100);       // Delay between updates (adjust as needed)
}
8

Sounds a lot like a power supply issue to me. Light up all the diodes on the strips and measure the supply voltage at both ends of each strip.

9

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