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FastLED conflicts with analogWrite on ESP8266? #896

LucianoPez opened this issue Sep 30, 2019 · 1 comment


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commented Sep 30, 2019

I've found a weird issue that I cant understand.
Here is a simple code that flash all pixel leds ON and OFF every 250 milliseconds. It works OK until I use the analogWrite function. If I uncomment the analogWrite line, I start to see some individual leds randomly changing color. I've tried different DATA_PIN and different pins on the analogWrite() but still the same. I've tried two different ESP8266 boards (wemos and NodeMcu) and still the same issue.

#include <FastLED.h>

#define DATA_PIN     05
#define CANT    28
#define BRIGHTNESS  150

CRGB leds[CANT];
unsigned long syncLastFlash = 0;
boolean lightOn = true;

void setup()
  FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, CANT).setCorrection( TypicalLEDStrip );
  //analogWrite(13, 100);  // This line cause some LEDs to randomly change color

void loop()
  if (millis() - syncLastFlash > 250)
    syncLastFlash = millis();
    lightOn = !lightOn;

    if (lightOn == true)
      for (byte j = 0; j < CANT; j++)
        leds[j] = CRGB(0, 0, 200);;

      for (byte j = 0; j < CANT; j++)
        leds[j] = CRGB(0, 0, 0);;

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commented Oct 10, 2019

What is the state of your electronics?
i.e. If you are driving a motor with that analogWrite it could suddenly draw a lot of current.

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