UNO R4 Wifi controlling WS2811 LED pixel

Other Hardware LEDs and Multiplexing
1

Hello there!

Recently I bought a Arduino UNO R4 Wifi wanting to use it to control a WS2811 LED pixel strip.
I am a bit familiar with the FastLED library thus I wanted to use it to do this project.
The FastLED library doesn't support the UNO R4 yet though.
Therefor I installed a version of the library which is supposed to support the R4.
Yet when I upload my sketch to the arduino the LED strip stays white.
I am using a 12V 3A PSU for the LED strip.
The Arduino is powerd through USB.
I checked the Arduino through the build in LED-matrix which works fine.
(BTW the strip does flicker a bit if the data pin is disconected and the white (data) wire is touched)

Below is my code, it's just a simple code to check if the LED strip works.

#include <FastLED.h>

#define NUM_LEDS 50
#define BRIGHTNESS 100
#define DATA_PIN 5


CRGB leds[NUM_LEDS];

void setup() {
  delay(2000);
  FastLED.addLeds<ws2811, DATA_PIN, RGB>(leds, NUM_LEDS);
  FastLED.clear();
}


void loop() {
  leds[0] = CRGB::Red;
  FastLED.show();
}

Does anyone have any idea why the strip doesn't respond?

2

I believe that you will find that it does. Which version of the FastLED library have you got installed ?

See GitHub - arduino/uno-r4-library-compatibility

I have not tested it extensively but it seems to work here

3

Damn, thanks! I am not at home so I can't test out the actual LED-strip itself but the library seems to be working fine with the Arduino. Not sure why it didn't work earlier.
Thanks again!

4

Aight, got home and tested it, sadly to no avail. Would it then be the LED strip or Arduino malfunctioning?
Or are the specific pins I need to use?

5

You should be able to use any GPIO pin

Which version of the FastLED library have you got installed ?

What exactly happens when you upload your sketch ?

6

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