ARDUINO UNO or TRINKET PRO 5V 6 Chasing LEDS with POT and PB

This small project is part 2 of 3. The first part see: https://create.arduino.cc/projecthub/MichDragstar/ultrasonic-sensor-with-alarm-lcd-and-temperature-a5dbab?ref=user&ref_id=410358&offset=0

In this part there are 6 chasing LEDS mounted in a circle to indicate the waterpump is pumping. In the real project the push button is replaced by a relay contact witch is activated by a magnet contact (Waterlevel high). The speed of the chasing LEDS can be adjust with the POT. I made this project first on the UNO, in the real project I use the TRINKET PRO 5V 16MHz. The OUTPUTS and the CODE does not change for the UNO or TRINKET.

    byte ledPin[] = {8, 9, 10, 11, 12, 13};    // Create array for LED pins
   int ledDelay; // delay between changes
   int direction = 1;
   int currentLED = 0;
   unsigned long changeTime;
   int potPin = 2;    // select the input pin for the potentiometer
   int buttonPin = 4;   
   int buttonState = 0;    
void setup() {
   pinMode(buttonPin, INPUT);  
   for (int x=0; x<6; x++) {   // set all pins to output
   		pinMode(ledPin[x], OUTPUT); }
     	changeTime = millis();     
  }
void loop() 
  {
    buttonState = digitalRead(buttonPin);
    ledDelay = analogRead(potPin); // read the value from the pot 
    if ((millis() - changeTime) > ledDelay) {      // if it has been ledDelay ms since last change
 		changeLED();
  		changeTime = millis();
 	}
   }
void changeLED() {
   for (int x=0; x<6; x++ ) {   // turn off all LED's
   		digitalWrite(ledPin[x], LOW);
 	}
   if (buttonState == HIGH) {
   digitalWrite(ledPin[currentLED], HIGH);} // turn on the current LED    
   else digitalWrite (ledPin[currentLED], LOW);
  currentLED += direction; // increment by the direction value
  if (currentLED == 6){currentLED = 0;
  }
  }