Thanks to John, Shabaz and Dragan for helping me.
jw0752 shabaz tomaja
/* binary countdowntime Kenneth Thomas January 5, 2016 Open source.. */ int greenLED = 13; int redLED = 12; int blueLED = 11; int whiteLED = 10; int flash = 1000; void setup() { // initialize digital pin 13 as an output. pinMode(13, OUTPUT); //green pinMode(12, OUTPUT); //red pinMode(11, OUTPUT); //blue pinMode(10, OUTPUT); //white } void loop() { for(int x = 0; x < 8; x++){ if(x==0){ digitalWrite(10, HIGH); digitalWrite(13,HIGH); digitalWrite(12,HIGH); digitalWrite(11,HIGH); delay(flash); digitalWrite(11,LOW); delay(flash); } else if(x==1){ digitalWrite(12,LOW); digitalWrite(11,HIGH); delay(flash); digitalWrite(11,LOW); delay(flash); } else if(x==2){ digitalWrite(13, LOW); digitalWrite(12, HIGH); digitalWrite(11, HIGH); delay(flash); digitalWrite(11, LOW); delay(flash); } else if(x==3){ digitalWrite(12, LOW); digitalWrite(11, HIGH); delay(flash); digitalWrite(11, LOW); delay(flash); } else if(x==4){ digitalWrite(10, LOW); digitalWrite(13,HIGH); digitalWrite(12,HIGH); digitalWrite(11,HIGH); delay(flash); digitalWrite(11,LOW); delay(flash); } else if(x==5){ digitalWrite(12,LOW); digitalWrite(11,HIGH); delay(flash); digitalWrite(11,LOW); delay(flash); } else if(x==6){ digitalWrite(13, LOW); digitalWrite(12, HIGH); digitalWrite(11, HIGH); delay(flash); digitalWrite(11, LOW); delay(flash); } else if(x==7){ digitalWrite(12, LOW); digitalWrite(11, HIGH); delay(flash); digitalWrite(11, LOW); delay(flash); } } }