4015IC Arduino Test

4015.ino

const int R_DATA = 1;
const int R_RESET = 2;
const int R_CLOCK = 3;

void setup() {
	pinMode(R_DATA, OUTPUT);
	pinMode(R_RESET, OUTPUT);
	pinMode(R_CLOCK, OUTPUT);

	int b[] = {0,0,0,0,1,0,1,1};
	writeByte(b);
}


void writeByte(int b[]) {
	// Reset all bits to LOW
	digitalWrite( R_RESET, LOW );

	// One by one, shift out
	for( int i=0; i<8; i++ ) {
		// LOW
		digitalWrite( R_DATA, LOW );
		digitalWrite( R_CLOCK, LOW );		

		// BIT status
		// Weirdly, DATA_LOW makes OUTPUT HIGH
		digitalWrite( R_DATA, b[i] == 1 ? LOW : HIGH );
		digitalWrite( R_CLOCK, HIGH );
	}	
	 
}