/**************************************************
Explanation of the Code:
Pin Setup: The 10 LEDs are connected to pins 2 through 11.
frequency Variable: Set to 2 Hz by default, meaning the
 LEDs will chase 2 times per second.
interval Calculation: The interval for switching LEDs 
is based on the frequency and determines how long each LED stays on.
LED Chasing Logic:
The millis() function ensures non-blocking timing for
 the LED chase.
Each LED is turned on for the calculated interval and
 then turns off as the next LED lights up.
The currentLed wraps around to 0 after reaching the last LED,
 making the chaser continuous.
Adjusting Speed:
To change the speed of the LED chase, you can modify the frequency variable. For example:
frequency = 5; would make the chase 5 times per second (faster).
frequency = 1; would make the chase 1 time per second (slower).

https://chatgpt.com/share/c0099c09-14ba-4cf1-aa96-49c3a8fd812d

by arvind patil









**************************************************/

const int numLeds = 10;  // Number of LEDs
int ledPins[numLeds] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};  // Pins connected to the LEDs
int currentLed = 0;      // To track the current LED
unsigned long previousMillis = 0;  // To store the last time an LED was updated
int frequency = 2;       // Frequency in Hz (chasing frequency)
unsigned long interval = 1000 / (2 * frequency); // Calculate interval (half-period for switching)

void setup() {
  // Set all LED pins as OUTPUT
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  unsigned long currentMillis = millis();

  // Check if it's time to move to the next LED
  if (currentMillis - previousMillis >= interval) {
    // Save the last time we updated the LEDs
    previousMillis = currentMillis;

    // Turn off all LEDs
    for (int i = 0; i < numLeds; i++) {
      digitalWrite(ledPins[i], LOW);
    }

    // Turn on the current LED
    digitalWrite(ledPins[currentLed], HIGH);

    // Move to the next LED, wrap around if necessary
    currentLed = (currentLed + 1) % numLeds;
  }
}