View difference between Paste ID: tZHUfGUh and CMYdX2Ms

 // Accepts 8 bits of data and outputs each bit to it's corresponding pin (pins array)
 void writeByte(byte data, byte[] pins){
 	// Loop through each of the 8 bits (start at zero, end at 7)
 	for(byte a = 0; a < 8; a++){
 		// shift the data to the right by 'a' bits and check to see if the first bit is set
 		// consider if data = 0x75 (01110101 in binary)
 		// the first iteration of the for loop will shift 01110101 by 0 (since a is 0 to start with)
 		//   since the first bit is a 1, pins[0] will output a HIGH
 		// the second iteration of the for loop will shift 01110101 by 1 (since a is now 1)
 		//   after the shift, the data will be 0111010 (notice there are now only 7 bits!)
 		//   since the first bit is now a 0, pins[1] will output a LOW
 		if((data >> a) & 0x01){
 			digitalWrite(pins[a], HIGH);
 		}else{
 			digitalWrite(pins[a], LOW);
 		}
 	}
 }