int stcp_pin = 4;
int shcp_pin = 3;
int ds_pin = 2;


void setup() {
  // put your setup code here, to run once:
pinMode(stcp_pin, OUTPUT);
pinMode(shcp_pin, OUTPUT);
pinMode(ds_pin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(stcp_pin, LOW);
shiftOut(ds_pin, shcp_pin, LSBFIRST, 255);
digitalWrite(stcp_pin, HIGH);
}