const int pinLED1=8;
const int pinLED2=7;
void setup() {
pinMode(pinLED1, OUTPUT);
pinMode(pinLED2, OUTPUT);
}
void loop() {
digitalWrite(pinLED1, HIGH);
digitalWrite(pinLED2, LOW);
delay(500);
digitalWrite(pinLED1, LOW);
digitalWrite(pinLED2, HIGH);
delay(500);
}