• To write program for blinking 8 LEDs for above given circuit, you have to define 8 variables first.
• Then you have to write 8 pinMode statements.
• Then you have to write 8+8=16 digitalWrite commands to make the LEDs on/off.
• This is sooooooo boring…!

Connection Details

The Code

int LED0=0; 
int LED1=1; 
int LED2=2; 
int LED3=3; 
int LED4=4; 
int LED5=5; 
int LED6=6; 
int LED7=7; 
void setup() 
{
  pinMode(LED0, OUTPUT);   
  pinMode(LED1, OUTPUT);   
  pinMode(LED2, OUTPUT); 
  pinMode(LED3, OUTPUT);   
  pinMode(LED4, OUTPUT);   
  pinMode(LED5, OUTPUT); 
  pinMode(LED6, OUTPUT);   
  pinMode(LED7, OUTPUT); 
}
void loop() 
{
  digitalWrite(LED0, HIGH);   
  digitalWrite(LED1, HIGH); 
  digitalWrite(LED2, HIGH);   
  digitalWrite(LED3, HIGH); 
  digitalWrite(LED4, HIGH);   
  digitalWrite(LED5, HIGH); 
  digitalWrite(LED6, HIGH);   
  digitalWrite(LED7, HIGH);   
  delay(1000); 


  digitalWrite(LED0, LOW);    
  digitalWrite(LED1, LOW); 
  digitalWrite(LED2, LOW);    
  digitalWrite(LED3, LOW); 
  digitalWrite(LED4, LOW);    
  digitalWrite(LED5, LOW); 
  digitalWrite(LED6, LOW);    
  digitalWrite(LED7, LOW);    
  delay(1000); 
}