Here is a better interpretation of LED Fade in & Fade out that may help someone .
also reducing the load on server without dropping your Blynk connection while these loops are running and that you’re having to wait until it reconnects
WidgetLED led1(vPIN_vv);
/*
FadeValue table to compensate for the nonlinearity of human vision.
Used in brightness to make 'dimming' look more natural.
Exponential function used to create values below :
x from 0 - 255 : y = round(pow( 2.0, x+64/40.0) - 1)
*/
const byte FadeValue[] = {
0, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6,
6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8,
8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11,
11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15,
15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 20,
20, 20, 21, 21, 22, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, 26,
27, 27, 28, 28, 29, 29, 30, 30, 31, 32, 32, 33, 33, 34, 35, 35,
36, 36, 37, 38, 38, 39, 40, 40, 41, 42, 43, 43, 44, 45, 46, 47,
48, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62,
63, 64, 65, 66, 68, 69, 70, 71, 73, 74, 75, 76, 78, 79, 81, 82,
83, 85, 86, 88, 90, 91, 93, 94, 96, 98, 99, 101, 103, 105, 107, 109,
110, 112, 114, 116, 118, 121, 123, 125, 127, 129, 132, 134, 136, 139, 141, 144,
146, 149, 151, 154, 157, 159, 162, 165, 168, 171, 174, 177, 180, 183, 186, 190,
193, 196, 200, 203, 207, 211, 214, 218, 222, 226, 230, 234, 238, 242, 248, 255,
};
BLYNK_WRITE(vPIN_FADE_IN) {
for (int i = 0 ; i <= 255; i += 16) {
analogWrite(LED_120, FadeValue[i]*4);
Blynk.virtualWrite(vPIN_vv,FadeValue[i]);
}
analogWrite(LED_120, 1023);
Blynk.virtualWrite(vPIN_vv,FadeValue[255]);
Blynk.virtualWrite(vPIN_FADE_IN,FadeValue[255]);
}
BLYNK_WRITE(vPIN_FADE_OUT) {
for (int i = 255 ; i >= 0; i -= 16) {
analogWrite(LED_120, FadeValue[i]*4);
Blynk.virtualWrite(vPIN_vv,FadeValue[i]);
}
analogWrite(LED_120, 0);
Blynk.virtualWrite(vPIN_vv,FadeValue[0]);
Blynk.virtualWrite(vPIN_FADE_OUT,FadeValue[0]);
}