#define led 13
#define led1 10
void setup() {
  pinMode(led, OUTPUT);
  pinMode(led1, OUTPUT);
  Serial.begin(9600);// put your setup code here, to run once:

}

void loop() {
  digitalWrite(led, HIGH);// put your main code here, to run repeatedly:
  digitalWrite(led1, LOW);
  Serial.begin("led is alternative");
  delay(2000);
  digitalWrite(led, LOW);// put your main code here, to run repeatedly:
  digitalWrite(led1, HIGH);
  Serial.begin("led is alternative");
  delay(2000);