void setup() {
// initialize digital pin 5 & 6 as an output.
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(2,INPUT);
digitalWrite(7,LOW);
digitalWrite(8,LOW);
digitalWrite(2,HIGH);}
// the loop function runs over and over again forever
void loop() {
int sw = digitalRead(2);
if(sw==LOW)
{digitalWrite(7,HIGH);
delay(100);
digitalWrite(7,LOW);
digitalWrite(8,HIGH);
delay(100);
digitalWrite(8,LOW);
digitalWrite(7,HIGH);
delay(100);
digitalWrite(7,LOW);
digitalWrite(8,HIGH);
delay(100);
digitalWrite(8,LOW);
delay(100);}
else
{digitalWrite(7,LOW);
digitalWrite(8,LOW);
}}