Hi, I have the problem that my WS2812B (aka Neopixel?) flickers when using colors that are mixed by the three base colors.
The very first LED works reliable. All other (no regarding whether by code set to on or off) changes its color and brightness unpredictable. For my application I need white.
The HardwareSetting:
- 18 LEDs WS2812B
- power supplied new each 5 LEDs
- Data Line length about 2 cm up to 5 cm each node2node
- tested with Arduino Uno and Mini Pro 328
- 1000 µF 16 V at "Power Dispatch Point"
- 0,1 µF at the first 8 LEDs
- 330 Ohm Resistor in line -> Microcontroller <> first LED
What I tested
- different colors (mixed)
no Effect - different colors (pure)
works - having mixed an pure colors
till the first mixed color works
this first mixed and following LEDs flickers - change Brightness
that actually had an impact to frequency of flickering, but not reliable - adding big Capacitor
no Effect - adding small Capacitors
no Effect - increased the diameter of datal ine
no Effect - increased the diameter of used power line
no Effect - switched DataPin from 3 to 4
no Effect - switchted Microcontroller (ground connected to circuit)
no Effect - exchange first and second LED in line by new one
no Effect - reduce my Code to only show some static LED lights
no Effect - change COLOR_ORDER
no Effect - change delay to FastLED.delay
made things worse (in other words: frequence of flicker increased)
My Code:
#include <FastLED.h>
#define entryCount 18
#define LED_DATA_PIN 3
#define LED_TYPE WS2812B
#define COLOR_ORDER GRB
#define BRIGHTNESS 200
CRGB leds[entryCount];
#define color CRGB:: Green
void setup() {
FastLED.addLeds<LED_TYPE,LED_DATA_PIN,COLOR_ORDER>(leds, entryCount).setCorrection(TypicalLEDStrip);
FastLED.setBrightness(BRIGHTNESS);
delay(1000);
leds[0] = color;
leds[1] = color;
leds[2] = color;
leds[8] = color;
leds[9] = color;
leds[10] = CRGB::White;
leds[11] = color;
leds[12] = color;
leds[16] = CRGB::White;
leds[17] = color;
}
void loop() {
FastLED.show();
/*FastLED.*/delay(500);
}
I checked the PowerSupply with my oscillator with holding 4.99 Volt - it never fall below this point.
About one tip I am curious I often read about is to connect ground at first and 5V second. How can I handle this when plug in my USB Connector?
