// Define pins for the vibration motors
const int motor1 = 3;
const int motor2 = 5;
const int motor3 = 7;
const int motor4 = 9;

// Define the duration and frequency of vibration bursts
const int vibrationDuration = 100; // Duration of each vibration burst in milliseconds
const int baseInterval = 667; // Base interval between bursts in milliseconds
const float jitterFactor = 0.235; // Jitter factor for variability in the interval

// Function to deliver a single vibratory burst to a specific motor
void vibrateMotor(int motorPin) {
  digitalWrite(motorPin, HIGH);
  delay(vibrationDuration);
  digitalWrite(motorPin, LOW);
}

// Function to add jitter to the interval
int addJitter(int baseInterval) {
  float jitter = random(-baseInterval * jitterFactor, baseInterval * jitterFactor + 1);
  return baseInterval + jitter;
}

void setup() {
  // Initialize the motor pins as outputs
  pinMode(motor1, OUTPUT);
  pinMode(motor2, OUTPUT);
  pinMode(motor3, OUTPUT);
  pinMode(motor4, OUTPUT);
  
  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // vCR sequence (3:2 ON-OFF pattern)
  for (int i = 0; i < 3; i++) { // Three ON cycles
    vibrateMotor(motor1);
    delay(addJitter(baseInterval));

    vibrateMotor(motor2);
    delay(addJitter(baseInterval));

    vibrateMotor(motor3);
    delay(addJitter(baseInterval));

    vibrateMotor(motor4);
    delay(addJitter(baseInterval));
  }
  
  // Two OFF cycles (pauses)
  delay(2 * baseInterval);

  // Short delay before the next 3:2 cycle
  delay(baseInterval);
}