4*4Plain

const int dataPin = 9;

const int latchPin = 10;

const int clockPin = 11;

const int a3Pin = 14;

const int a2Pin = 15;

const int a1Pin = 16;

//試著改變 dt 的值，找到可以騙過眼睛造成視覺暫留的門檻值

int dt = 3;

int loopCnt=100;

void setup() {

  pinMode(latchPin,OUTPUT);

  pinMode(clockPin,OUTPUT);

  pinMode(dataPin,OUTPUT);

  pinMode(a1Pin,OUTPUT);

  pinMode(a2Pin,OUTPUT);

  pinMode(a3Pin,OUTPUT);

}

void loop() {

  for(int dd=0;dd<loopCnt;dd++){

  digitalWrite(a3Pin,LOW);

  digitalWrite(a2Pin,LOW);

  digitalWrite(a1Pin,LOW);

    //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 3);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt);

  digitalWrite(a3Pin,HIGH);

  digitalWrite(a2Pin,LOW);

  digitalWrite(a1Pin,LOW);

  //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 3);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt);

  digitalWrite(a3Pin,LOW);

  digitalWrite(a2Pin,HIGH);

  digitalWrite(a1Pin,LOW);

  //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 12);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt);

  digitalWrite(a3Pin,HIGH);

  digitalWrite(a2Pin,HIGH);

  digitalWrite(a1Pin,LOW);

  //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 12);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt); 

    //重發清除的資料解決殘餘弱電顯示微光的問題

//Pull latch LOW to start sending data

digitalWrite(latchPin, LOW);

//Send the data

shiftOut(dataPin, clockPin, MSBFIRST, 0);

//Pull latch HIGH to stop sending data

digitalWrite(latchPin, HIGH);

  }

   for(int dd=0;dd<loopCnt;dd++){

  digitalWrite(a3Pin,LOW);

  digitalWrite(a2Pin,LOW);

  digitalWrite(a1Pin,LOW);

    //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 12);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt);

  digitalWrite(a3Pin,HIGH);

  digitalWrite(a2Pin,LOW);

  digitalWrite(a1Pin,LOW);

  //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 12);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt);

  digitalWrite(a3Pin,LOW);

  digitalWrite(a2Pin,HIGH);

  digitalWrite(a1Pin,LOW);

  //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 3);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt);

  digitalWrite(a3Pin,HIGH);

  digitalWrite(a2Pin,HIGH);

  digitalWrite(a1Pin,LOW);

  //Pull latch LOW to start sending data

    digitalWrite(latchPin, LOW);

    //Send the data

    shiftOut(dataPin, clockPin, MSBFIRST, 3);

    /*MSBFIRST的意思是most significant bit first，也就是最先輸出的會是number（是個uint8_t，有8個bits，第7個bit是MSB，第0個bit是LSB）的第7個bit。如果改用LSBFIRST（least significant bit first），那麼最先輸出的會是第0個*/

    //Pull latch LOW to end sending data

    digitalWrite(latchPin, HIGH);

    delay(dt); 

    //重發清除的資料解決殘餘弱電顯示微光的問題

//Pull latch LOW to start sending data

digitalWrite(latchPin, LOW);

//Send the data

shiftOut(dataPin, clockPin, MSBFIRST, 0);

//Pull latch HIGH to stop sending data

digitalWrite(latchPin, HIGH);

}

}