int motorPin = 10; // PWM pin to control the motor
int onTime = 3000; // duration in milliseconds of the motor on time (3 seconds)
int offTime = 3000; // duration in milliseconds of the motor off time (3 seconds)

void setup() {
  pinMode(motorPin, OUTPUT); // set the motor control pin as an output
}

void loop() {
  analogWrite(motorPin, 255); // turn on the motor at maximum speed (255 is the maximum value)
  delay(onTime); // wait for 3 seconds
  analogWrite(motorPin, 0); // stop the motor (PWM value of 0)
  delay(offTime); // wait for 3 seconds before restarting the cycle
}