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I am using a led strip WS2812b, an ESP8266 (NodeMCU 1.0) and a gesture sensor APDS9960. I want that when I move my hand from left to right and from right to left I change the colors of the strip of leds, previously saved in an array of strings:

const char * colors [11] = {"CRGB :: White", 
"CRGB :: WhiteSmoke", 
"CRGB :: CadetBlue", 
"CRGB :: SteelBlue", 
"CRGB :: Teal", 
"CRGB :: SlateGray" , 
"CRGB :: MediumPurple", 
"CRGB :: Purple", 
"CRGB :: PapayaWhip", 
"CRGB :: LightPink", 
"CRGB :: Crimson"};

But when I'm going to turn on the colors using the functions of the FastLed library in this way:

for (int i = 0; i <NUM_LEDS; i = i + 1) {
       leds [i] = colors [2];
       FastLED.show ();
       delay (10);}

All I get is this error:

invalid conversion from 'const char *' to 'uint32_t {aka unsigned int}' [-fpermissive]

I guess the problem is me when declaring the array, could someone help me?

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1 Answer 1

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3

You don't want an array of strings containing the (badly formatted) names of variables. Instead you want an array of 32-bit integers containing the values held within those variables.

const uint32_t colors[] = {
    CRGB::White, 
    CRGB::WhiteSmoke, 
    CRGB::CadetBlue, 
    CRGB::SteelBlue, 
    CRGB::Teal, 
    CRGB::SlateGray, 
    CRGB::MediumPurple, 
    CRGB::Purple, 
    CRGB::PapayaWhip, 
    CRGB::LightPink, 
    CRGB::Crimson
};

Since colours are just numbers, in the (hexadecimal) form of 0xRRGGBB you just store them as 32-bit unsigned integers. The names you have there are just such (constant) variables used for easy reference (CRGB::White is 0xFFFFFF).

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  • Thanks!!! Your recomendation did the work correctly!!! Thanks again!!! Commented Sep 27, 2018 at 20:44

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