//Connect 8 LEDs to arduino uno pins 2,3,4,5,6,7,8,9
//Connect 1 push button to arduino uno pin 10

int led1=2;
int led2=3;
int led3=4;
int led4=5;
int led5=6;
int led6=7;
int led7=8;
int led8=9;

int button1=10;
int currentbuttonstate=1;
int lastbuttonstate=1;
int pattern_count=0;

void setup() {

  Serial.begin(115200);
  pinMode(button1,INPUT);
  pinMode(led1,OUTPUT);
  digitalWrite(led1,LOW);
  pinMode(led2,OUTPUT);
  digitalWrite(led2,LOW);
  pinMode(led3,OUTPUT);
  digitalWrite(led3,LOW);
  pinMode(led4,OUTPUT);
  digitalWrite(led4,LOW);
  pinMode(led5,OUTPUT);
  digitalWrite(led5,LOW);
  pinMode(led6,OUTPUT);
  digitalWrite(led6,LOW);
  pinMode(led7,OUTPUT);
  digitalWrite(led7,LOW);
  pinMode(led8,OUTPUT);
  digitalWrite(led8,LOW);
  
}


void loop() {

  currentbuttonstate=digitalRead(button1);
  Serial.print("current:");
  Serial.println(currentbuttonstate);
  Serial.print("last:");
  Serial.println(lastbuttonstate);
  Serial.println("********************");
  if(currentbuttonstate==0 and lastbuttonstate==1){
    pattern_count=pattern_count+1;
  }
  if(pattern_count==1){
    delay(50);
    digitalWrite(led4,HIGH);
    digitalWrite(led5,HIGH);
    delay(50);
    digitalWrite(led4,LOW);
    digitalWrite(led5,LOW);
    digitalWrite(led3,HIGH);
    digitalWrite(led6,HIGH);
    delay(50);
    digitalWrite(led3,LOW);
    digitalWrite(led6,LOW);
    digitalWrite(led2,HIGH);
    digitalWrite(led7,HIGH);
    delay(50);
    digitalWrite(led2,LOW);
    digitalWrite(led7,LOW);
    digitalWrite(led1,HIGH);
    digitalWrite(led8,HIGH);
    delay(50);
    digitalWrite(led1,LOW);
    digitalWrite(led8,LOW);
    delay(50);
  }
  if(pattern_count==2){
   delay(50);
   digitalWrite(led1,HIGH);
   delay(50);
   digitalWrite(led1,LOW);
   delay(50);
   digitalWrite(led2,HIGH);
   delay(50);
   digitalWrite(led2,LOW);
   delay(50);
   digitalWrite(led3,HIGH);  
   delay(50);
   digitalWrite(led3,LOW);
   delay(50);
   digitalWrite(led4,HIGH);
   delay(50);
   digitalWrite(led4,LOW);
   delay(50);
   digitalWrite(led5,HIGH);
   delay(50);
   digitalWrite(led5,LOW);
   delay(50);
   digitalWrite(led6,HIGH);
   delay(50);
   digitalWrite(led6,LOW);
   delay(50);
   digitalWrite(led7,HIGH);
   delay(50);   
   digitalWrite(led7,LOW);      
   delay(50);
   digitalWrite(led8,HIGH);
   delay(50);
   digitalWrite(led8,LOW);
   delay(50);

  }

  if(pattern_count==3){
    
   digitalWrite(led2,HIGH);
   digitalWrite(led4,HIGH);
   digitalWrite(led6,HIGH);
   digitalWrite(led8,HIGH);
   delay(100);
   digitalWrite(led2,LOW);
   digitalWrite(led4,LOW);
   digitalWrite(led6,LOW);
   digitalWrite(led8,LOW);
   delay(100);
   digitalWrite(led1,HIGH);
   digitalWrite(led3,HIGH);
   digitalWrite(led5,HIGH);
   digitalWrite(led7,HIGH);
   delay(100);
   digitalWrite(led1,LOW);
   digitalWrite(led3,LOW);
   digitalWrite(led5,LOW);
   digitalWrite(led7,LOW);
   delay(100);
  }
  
  lastbuttonstate=currentbuttonstate;
  delay(200);

}