#define serPin 3
unsigned char conbyte =0xAA; //working variable
unsigned char reg; //conbyte storing register for ease
unsigned char k; //loop variable
void setup() {
  DDRC |= (1<<serPin);
}
void loop() {
  reg= conbyte;
  for(k=0; k<8; k++)
  {
    if(reg & 0x80)
    {PORTC |= (1<<serPin);} //setting value if value in register is 1
    else
    {PORTC &= ~(1<<serPin);} //resetting value if value in register is 0
    reg= reg<<1; //updating LSB, left shift once
    delay(500); //regular delay
  }
  delay(2000); //concluding delay
}