Page 339 - 최강 아두이노 퍼스트 참고서

const int clockPin = 12;
////Pin connected to Data in (DS) of 74HC595
const int dataPin = 11;

void setup() {
//set pins to output because they are addressed in the main
loop
pinMode(latchPin, OUTPUT);
pinMode(dataPin, OUTPUT);
pinMode(clockPin, OUTPUT);

Serial.begin(9600);
Serial.println("reset");
}

void loop()
{
if (Serial.available() > 0)
{
// ASCII '0' through '9' characters are
// represented by the values 48 through 57.
// so if the user types a number from 0 through 9 in
ASCII,
// you can subtract 48 to get the actual value:
int bitToSet = Serial.read() - 48;

// write to the shift register with the correct bit set
high:
registerWrite(bitToSet, HIGH);
}
}
// This method sends bits to the shift register:
void registerWrite(int whichPin, int whichState)
{
// the bits you want to send
byte bitsToSend = 0;

// turn off the output so the pins don't light up
// while you're shifting bits:
digitalWrite(latchPin, LOW);

// turn on the next highest bit in bitsToSend:
bitWrite(bitsToSend, whichPin, whichState);

// shift the bits out:
shiftOut(dataPin, clockPin, MSBFIRST, bitsToSend);

// turn on the output so the LEDs can light up:
digitalWrite(latchPin, HIGH);
}

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