int btnPin = 2;
int ledPin1 = 9;//LED 1
int ledPin2 = 10;//LED 2

int btnState = 0;
int prevBtnState = 0;
int counter = 0;

void setup() {
  // Open the serial port
  Serial.begin(9600);
  // set the button pin to be an input
  pinMode(btnPin, INPUT);
  // set the LED pin to be an OUTPUT
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
}

void loop() {
  // read the button pin
  btnState = digitalRead(btnPin);

  // check if the button state has changed
  if(btnState != prevBtnState){
    // print the changed state
    Serial.print("Button state changed to: ");
    Serial.println(btnState);
    prevBtnState =1;

    if (btnState == HIGH) {
      int remainder = counter % 3;
      digitalWrite(ledPin1, remainder != 0);
      digitalWrite(ledPin2, remainder > 1);
      Serial.println(remainder);
      counter++;
    }

    if (btnState == LOW) {
      prevBtnState = 0;
    }
  }
  delay(10);
  
}