#define led 13
#define led2 12
#define led3 8
#define led4 7
void setup() {
pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
}
void loop() {
digitalWrite(led, HIGH);
delay(1000);
digitalWrite(led2, HIGH);
delay(1000);
digitalWrite(led3, HIGH);
delay(1000);
digitalWrite(led4, HIGH);
delay(1000);
digitalWrite(led, LOW);
delay(1000);
digitalWrite(led2, LOW);
delay(1000);
digitalWrite(led3, LOW);
delay(1000);
digitalWrite(led4, LOW);
delay(1000);
}