Arduino Multi-Function Shield V2

/*

  9FEB2019
  Sketch uses 2312 bytes (7%) of program storage space. Maximum is 32256 bytes.
  Global variables use 38 bytes (1%) of dynamic memory, leaving 2010 bytes for local variables. Maximum is 2048 bytes.

*/

//Pressing nothing Displays value of analog revolving potentiometer 0-1024
//pressing key1 Shows 0123 on LED Segment Displays
//pressing key2 Buzzer ringing
//pressing key3 The four on-board LEDs light in sequence

//Defining three pins of 74HC595 for the LED Numerical Display
int latchPin = 4;//ST_CP
int clockPin = 7;//SH_CP
int dataPin = 8; //DS

//Defining three buttons for input
int key1 = A1;
int key2 = A2;
int key3 = A3;

//Defining the buzzer pin
int buzzer = 3;

//Defining the potentiometer input for A/D conversion
int pot = A0;

//Pin definition for the LEDs
int led1 = 13;
int led2 = 12;
int led3 = 11;
int led4 = 10;

int dat_wei[4] = {0x01, 0x02, 0x04, 0x08}; //LED Segment Displays showing 1--4
int dat_duan[10] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90}; //LED Segment Displays showing 0--9
char i = 0;

// Run once at the beginning or after a [Reset]
void setup ()
{
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(key1, INPUT);
  pinMode(key2, INPUT);
  pinMode(key3, INPUT);
  pinMode(buzzer, OUTPUT);
  digitalWrite(buzzer, HIGH); // Sound Off;

  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  //  pinMode(led5, OUTPUT);
  //  pinMode(led6, OUTPUT);
  for (char i = 8; i < 14; i++)
    digitalWrite(i, HIGH);
}

// Main Program Loop (Runs continuously)
void loop()
{
  if (digitalRead(key1) == LOW )
    SMG(); //testing LED Segment Displays
  if (digitalRead(key2) == LOW )
    buzzer_(); //testing buzzer
  if (digitalRead(key3) == LOW)
    led_display(); //testing LED
  if (digitalRead(key1) == HIGH & digitalRead(key2) == HIGH & digitalRead(key3) == HIGH)
    analog(); //testing analog input
}

// Using the 7 Segment X 4 Digit LEDs Display
void SMG(void)
{
  digitalWrite(latchPin, LOW); //clear LED Segment Displays
  shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
  digitalWrite(latchPin, HIGH);
  while (1)
  {
    digitalWrite(latchPin, LOW);
    //MSBFIRST,transmitting binary bit from high to low,74HC595 starts from first piece, and displaces data from Q0 to Q7. If there is data, it will start from the second piece like this.
    shiftOut(dataPin, clockPin, MSBFIRST , dat_duan[i]); //data about second piece
    shiftOut(dataPin, clockPin, MSBFIRST , dat_wei[i]); //way of MSBFIRST,data about first piece
    digitalWrite(latchPin, HIGH);
    i++;
    if (i == 4) {
      i = 0;
    }
    if (digitalRead(key1) == HIGH)
    {
      digitalWrite(latchPin, LOW); //clear LED Segment Displays
      shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
      shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
      digitalWrite(latchPin, HIGH);
      break;
    }
  }
}

// Using the Buzzer
void buzzer_(void)
{
  char i;
  digitalWrite(latchPin, LOW); //clear LED Segment Displays
  shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
  digitalWrite(latchPin, HIGH);
  while (1)
  {
    for (i = 0; i < 80; i++) // output a frequency sound
    {
      digitalWrite(buzzer, LOW); // sound
      delay(1);//delay1ms
      digitalWrite(buzzer, HIGH ); //not sound
      delay(1);//ms delay
    }
    for (i = 0; i < 100; i++) // output a frequency sound
    {
      digitalWrite(buzzer, LOW); // sound
      digitalWrite(buzzer, HIGH); //not sound
      delay(2);//2ms delay
    }
    if (digitalRead(key2) == HIGH)
    {
      digitalWrite(latchPin, LOW); //clear LED Segment Displays
      shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
      shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
      digitalWrite(latchPin, HIGH);
      break;
    }
  }
}

// Using the 4 LEDs in sequence
void led_display()
{
  digitalWrite(latchPin, LOW); //clear LED Segment Displays
  shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x00);
  digitalWrite(latchPin, HIGH);

  while (1)
  {
    digitalWrite(led1, LOW);
    delay(100);
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    delay(100);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
    delay(100);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, LOW);
    delay(100);
    digitalWrite(led4, HIGH);
    //   digitalWrite(led5, LOW);
    delay(100);
    //    digitalWrite(led5, HIGH);
    //    digitalWrite(led6, LOW);
    delay(100);
    //    digitalWrite(led6, HIGH);
    if (digitalRead(key3) == HIGH)
    {
      break;
    }
  }
}

// Read the potentiometer voltage value
void analog()
{
  int val, qian, bai, shi, ge;
  val = analogRead(pot);
  qian = val / 1000;
  bai = val % 1000;
  bai = bai / 100;
  shi = val % 100;
  shi = shi / 10;
  ge = val % 10;
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST , dat_duan[qian]);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x01);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST , dat_duan[bai]);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x02);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST , dat_duan[shi]);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x04);
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST , dat_duan[ge]);
  shiftOut(dataPin, clockPin, MSBFIRST , 0x08);
  digitalWrite(latchPin, HIGH);
}