//b1
const int b1 = 2;
int bs1 = 0;
int pbs1 = 0;
//b2
const int b2 = 3;
int bs2 = 0;
int pbs2 = 0;

int counter = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
Serial.begin(9600);
Serial.println("Button Pushes");

}

void loop() {
  // put your main code here, to run repeatedly:
bs1 = digitalRead(b1);
bs2 = digitalRead(b2);

//b1
if(bs1 != pbs1)
  {
    if(bs1 == LOW)
    {
      counter++;
    }
    if(counter > 4)
    {
      counter = 4;
    }
    delay(50);
  }

pbs1 = bs1;

//b2
if(bs2 != pbs2)
  {
    if(bs2 == LOW)
    {
      counter--;
    }
    if(counter < 0)
    {
      counter = 0;
    }
    delay(50);
  }

pbs2 = bs2;

Serial.println(counter);
if(counter == 0)
{
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
}

if(counter == 1)
{
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
}
  
if(counter == 2)
{
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
}

if(counter == 3)
{
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, LOW);
}

if(counter == 4)
{
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
}

}