// Lab Practice #2.6 : Turn on (LED Blink Alternate)
// define devices pin // 
#define LED1 7 // EXTERNAL LED on pin 7
#define LED2 8 // EXTERNAL LED on pin 8
void setup() 
{
  pinMode(LED1, OUTPUT); // External LED as Output
  pinMode(LED2, OUTPUT); // External LED as Output
}
void loop() 
{
  digitalWrite(LED1, HIGH);  // LED1 on 
  digitalWrite(LED2, LOW);  // LED2 off
  delay(1000);               // Delay for 1sec

  digitalWrite(LED1, LOW);  // LED1 off
  digitalWrite(LED2, HIGH);  // LED2 on
  delay(1000);              // Delay for 1sec
}