LEDs Fading Speed Control

Solving Approach:

How do you plan to solve it?

I solved this task in two main steps:

1.- I created a program that can increase the brightness of LED number 1 and 3 and decrease the LED numer 2 and 4 using the following code lines:  

analogWrite(leds[0],i);    // bright Increases
analogWrite(leds[2],i);

 analogWrite(leds[1],255-i);    // bright decreases
 analogWrite(leds[3],255-i);

2.- I added a delay sentence where its time parameter depends on the adc value from a potenciometer to control the fade speed 

Code

/*Paste your code here*/

const char leds[] = {3,5,6,9};
const char pot = A0;

void setup() {
   for(int i = 0; i<4; i++) pinMode(leds[i], OUTPUT);

   for(int i = 0; i<4; i++) digitalWrite(leds[i], LOW);
}

void loop() {
  
  for(int i=0; i<=255; i++){
  int adc = map(analogRead(pot), 0, 1023, 300 , 1500);
  analogWrite(leds[0],i);
  analogWrite(leds[2],i);

  analogWrite(leds[1],255-i);
  analogWrite(leds[3],255-i);
  delayMicroseconds(adc);
  }

  for(int i=255; i>=0; i--){
  int adc = map(analogRead(pot), 0, 1023, 300 , 1500);
  analogWrite(leds[0],i);
  analogWrite(leds[2],i);

  analogWrite(leds[1],255-i);
  analogWrite(leds[3],255-i);
  delayMicroseconds(adc);
  }

}

Output

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