int ledred=4;

int ledyellow=7;

int ledgreen=8;

void setup() {

  pinMode(ledred,OUTPUT);

  pinMode(ledgreen,OUTPUT);

  pinMode(ledyellow,OUTPUT);

  // put your setup code here, to run once:

}



void loop() {

  digitalWrite(ledred,HIGH);

  delay(4000);

  digitalWrite(ledyellow,HIGH);

  digitalWrite(ledred,LOW);

  delay(1000);

  digitalWrite(ledgreen,HIGH);

  digitalWrite(ledred,LOW);

  digitalWrite(ledyellow,LOW);

  delay(3000);

  digitalWrite(ledyellow,LOW);  

  digitalWrite(ledgreen,LOW); 

  digitalWrite(ledred, HIGH); 

  delay(2000);     

  digitalWrite(ledyellow,LOW); }  // put your main code here, to run repeatedly: