int latch = 13;
int store = 8;
int clock = 4;
int enable = 7;
int nT1 = 0b00000001;
int nT2 = 0b00000010;

void setup()
{
	pinMode(latch,OUTPUT);
	pinMode(store,OUTPUT);
	pinMode(clock,OUTPUT);
}

void loop()
{
	// Forward
	digitalWrite(latch, LOW);
	digitalWrite(12, HIGH);
	shiftOut(store, clock, MSBFIRST, nT1);
	digitalWrite(latch, HIGH);
	delay(1000);

	// Reverse
	digitalWrite(latch, LOW);
	digitalWrite(12, HIGH);
	shiftOut(store, clock, MSBFIRST, nT2);
	digitalWrite(latch, HIGH);
	delay(1000);
}