// Define the LED pins and button pin
#define LED1 2
#define LED2 3
#define LED3 4
#define LED4 5
#define BUTTON 6

// Define the initial blink rates for each LED
int blinkRate1 = 60;
int blinkRate2 = 60;
int blinkRate3 = 60;
int blinkRate4 = 60;

void setup() {
  // Set LED pins as outputs
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  
  // Set button pin as input
  pinMode(BUTTON, INPUT_PULLUP);
  
  // Start serial communication
  Serial.begin(9600);
}

void loop() {
  // Blink LED1 with a faster rate if the button is pressed
  if (digitalRead(BUTTON) == LOW) {
    blinkRate1 *= 0.99;  // Increase blink rate by 20%
  } else {
    blinkRate1 = 60;  // Set blink rate back to original value
  }
  
  // Blink all LEDs at their respective blink rates
  digitalWrite(LED1, HIGH);
  delay(blinkRate1);
  digitalWrite(LED1, LOW);
  
  digitalWrite(LED2, HIGH);
  delay(blinkRate2);
  digitalWrite(LED2, LOW);
  
  digitalWrite(LED3, HIGH);
  delay(blinkRate3);
  digitalWrite(LED3, LOW);
  
  digitalWrite(LED4, HIGH);
  delay(blinkRate4);
  digitalWrite(LED4, LOW);
  
  // Print the blink rates of all LEDs to serial monitor
  Serial.print("LED1: ");
  Serial.print(60000 / blinkRate1);
  Serial.print(" bpm, LED2 : ");
  Serial.print(60000 / blinkRate2);
  Serial.print(" bpm, LED3 : ");
  Serial.print(60000 / blinkRate3);
  Serial.print(" bpm, LED4 : ");
  Serial.print(60000 / blinkRate4);
  Serial.println(" bpm");
}