m5stack-colors.ino

uint16_t getFillColor(uint8_t r, uint8_t g, uint8_t b)
{
  return ((r / 8) << 11) | ((g / 4) << 5) | (b / 8);
}

void loop()
{  
  M5.update();

  // get the latest color
  colorHttp.begin("https://m5stack.glitch.me/getColor");
  int colorHttpCode = colorHttp.GET();

  if(colorHttpCode > 0){
    if(colorHttpCode == HTTP_CODE_OK){
        String rgb = colorHttp.getString();
        M5.Lcd.setTextSize(3);
        M5.Lcd.println("GET "  + rgb);
        M5.Lcd.println("rgb");
        M5.Lcd.println(rgb);
        // this returns a string in the format [r, g, b];

        // extra out the r g b components
        int rEnd = rgb.indexOf(",");
        M5.Lcd.println("rEnd " + rEnd);
        int gEnd = rgb.lastIndexOf(",");
        M5.Lcd.println("gEnd " + gEnd);
        int r = rgb.substring(1, rEnd).toInt();
        int g = rgb.substring(rEnd+1, gEnd).toInt();
        int b = rgb.substring(gEnd+1, rgb.length()-1).toInt();
        M5.Lcd.print("red ");
        M5.Lcd.print(r);
        M5.Lcd.print(" green ");
        M5.Lcd.print(g);
        M5.Lcd.print(" blue ");
        M5.Lcd.print(b);

        // convert type to uint16_t color
        uint16_t color = getFillColor(r, g, b);
        M5.Lcd.println("color ");
        M5.Lcd.println(color);

        // fill the m5Stack display with the color
        M5.Lcd.fillScreen(color);
    }
    
  }else{
    M5.Lcd.println(colorHttp.errorToString(colorHttpCode).c_str());
  }
}