The code for 4 switch voting machine with buzzer on Raspberry Pi

voting.c

#include<wiringPi.h>
#include<stdio.h>

#define RS 11
#define EN 10
#define D4 6
#define D5 5
#define D6 4
#define D7 1

#define led1 14
#define led2 26
#define led3 16
#define led4 28
#define led5 29 //green
#define buzz 13

#define in1 21
#define in2 22 
#define in3 23
#define in4 24
#define in5 25

int vote1=0,vote2=0,vote3=0,vote4=0;
int i=0;

char vote[5];

void compare();
void show();

  void lcdcmd(unsigned char ch)
  {
    int temp=0x80;
    digitalWrite(D4, temp & ch<<3);
    digitalWrite(D5, temp & ch<<2);
    digitalWrite(D6, temp & ch<<1);
    digitalWrite(D7, temp & ch);
    digitalWrite(RS, LOW);
    digitalWrite(EN, HIGH);
    delay(10);
    digitalWrite(EN, LOW);
    digitalWrite(D4, temp & ch<<7);
    digitalWrite(D5, temp & ch<<6);
    digitalWrite(D6, temp & ch<<5);
    digitalWrite(D7, temp & ch<<4);
    digitalWrite(RS, LOW);
    digitalWrite(EN, HIGH);
    delay(10);
    digitalWrite(EN, LOW);
  }

    void write(unsigned char ch)
  {
    int temp=0x80;
    digitalWrite(D4, temp & ch<<3);
    digitalWrite(D5, temp & ch<<2);
    digitalWrite(D6, temp & ch<<1);
    digitalWrite(D7, temp & ch);
    digitalWrite(RS, HIGH);
    digitalWrite(EN, HIGH);
    delay(10);
    digitalWrite(EN, LOW);
    digitalWrite(D4, temp & ch<<7);
    digitalWrite(D5, temp & ch<<6);
    digitalWrite(D6, temp & ch<<5);
    digitalWrite(D7, temp & ch<<4);
    digitalWrite(RS, HIGH);
    digitalWrite(EN, HIGH);
    delay(10);
    digitalWrite(EN, LOW);
  }
  
  void clear()
  {
     lcdcmd(0x01);
  }

  void setCursor(int x, int y)
  {
    int set=0;
    if(y==0)
    set=128+x;
    if(y==1)
    set=192+x;
    lcdcmd(set);
  }

  void print(unsigned char *str)
  {
    while(*str)
    {
     write(*str);
     str++;
    }
  }

  void begin(int x, int y)
  {
    lcdcmd(0x02);
    lcdcmd(0x28);
    lcdcmd(0x06);
    lcdcmd(0x0e);
    lcdcmd(0x01);
  }
  
void setup()
  {
  if(wiringPiSetup()==-1)
  printf("ERROR\n");
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(buzz, OUTPUT);
  pinMode(RS, OUTPUT);
  pinMode(EN, OUTPUT);
  pinMode(D4, OUTPUT);
  pinMode(D5, OUTPUT);
  pinMode(D6, OUTPUT);
  pinMode(D7, OUTPUT);
  pinMode(in1, INPUT);
  pinMode(in2, INPUT);
  pinMode(in3, INPUT);
  pinMode(in4, INPUT);
  pinMode(in5, INPUT);
  digitalWrite(in1, HIGH);
  digitalWrite(in2, HIGH);
  digitalWrite(in3, HIGH);
  digitalWrite(in4, HIGH);
  digitalWrite(in5, HIGH);
  begin(16,2);
}

void buzzer()
{
    digitalWrite(buzz, HIGH);
    delay(200);
    digitalWrite(buzz, LOW);
}

void wait()
{
     digitalWrite(led5, LOW);
     delay(200);
}

void main()
{
  setup();
  printf("Electronic Voting\n");
  print("Electronic Voting");
  setCursor(0,1);
  printf("Machine with RPI\n");
  print("Machine with RPI");
  delay(2000);
  clear();
  printf("Vote is fun\n");
  print("Vote is fun");
  setCursor(0,1);
  printf("Welcomes You\n");
  print("Welcomes You");
  delay(2000);
  clear();
  show();
  while(1)
  {
        digitalWrite(led5, HIGH);
        digitalWrite(in3, HIGH);
        
        if(digitalRead(in1)==0)
        {
            printf("Button1\n");
         ++vote1;
         digitalWrite(led1, HIGH);
         buzzer();
         digitalWrite(led1, LOW);
         wait();  
         show();              
        }
        
        if(digitalRead(in2)==0)
        {
            printf("Button2\n");
           ++vote2; 
           digitalWrite(led2, HIGH);
           buzzer();
           digitalWrite(led2, LOW);
           wait();  
           show();
           while(digitalRead(in2)==0);                 
        }
        
        else if(digitalRead(in3)==0)
        {
            printf("Button3\n");
           ++vote3;   
           digitalWrite(led3, HIGH);
           buzzer();
           digitalWrite(led3, LOW);
           wait();  
           show();     
           while(digitalRead(in3)==0);      
        }
        
        else if(digitalRead(in4)==0)
        {
            printf("Button4\n");
           ++vote4;  
           digitalWrite(led4, HIGH);
           buzzer();
           digitalWrite(led4, LOW);
           wait();  
           show();          
            while(digitalRead(in4)==0);      
        }
        
        else if(digitalRead(in5)==0)
        {
            printf("Button5\n");
            compare();
           while(digitalRead(in5)==0);      
        }
  }
}

void show()
{
        setCursor(0,0);
        printf("P1 P2 P3 P4\n");
        print("P1 P2 P3 P4");
        setCursor(1,1);
        sprintf(vote,"%d",vote1);
        print(vote);
        printf("%d ",vote1);
        setCursor(6,1);
        sprintf(vote,"%d",vote2);
        print(vote);
        printf("%d ",vote2);
        setCursor(10,1);
        sprintf(vote,"%d",vote3);
        print(vote);
        printf("%d ",vote3);
        setCursor(14,1);
        sprintf(vote,"%d",vote4);
        print(vote);
        printf("%d ",vote4);
        delay(100);
}

void compare()
{
    clear();
    printf("Please Wait....\n");
    wait();
   if(vote1 > vote2 && vote1>vote3 && vote1>vote4)
        {
          digitalWrite(led1, HIGH);
          for(i=0;i<1;i++)
          {
           clear();
           setCursor(0,0);
           printf("Congratulations.......\n");
           print("Congratulations.......");
           setCursor(0,1);
           printf("P1 Won election\n");
           print("P1 Won election");
           delay(2000);
           clear();
           setCursor(0,0);
           printf("P1 P2 P3 P4\n");
           print("P1 P2 P3 P4");
           setCursor(1,1);
           sprintf(vote,"%d",vote1);
           print(vote);
           printf("%d   ",vote1);
           setCursor(6,1);
           sprintf(vote,"%d",vote2);
           print(vote);
           printf("%d   ",vote2);
           setCursor(10,1);
           sprintf(vote,"%d",vote3);
           print(vote);
           printf("%d   ",vote3);
           setCursor(14,1);
           sprintf(vote,"%d",vote4);
           print(vote);
           printf("%d   ",vote4);
           delay(2000);
          }
           digitalWrite(led1, LOW);
        }
        
        else if(vote2 >vote1 && vote2>vote3 && vote2>vote4)
        {
          digitalWrite(led2, HIGH);
         for(i=0;i<1;i++)
         { 
          clear();
          setCursor(0,0);
          printf("Congratulations.......\n");
          print("Congratulations.......");
          setCursor(0,1);
          printf("P2 Won election\n");
          print("P2 Won election");
          delay(2000);
           clear();
           setCursor(0,0);
           printf("P1 P2 P3 P4\n");
           print("P1 P2 P3 P4");
           setCursor(1,1);
           sprintf(vote,"%d",vote1);
           print(vote);
           printf("%d   ",vote1);
           setCursor(6,1);
           sprintf(vote,"%d",vote2);
           print(vote);
           printf("%d   ",vote2);
           setCursor(10,1);
           sprintf(vote,"%d",vote3);
           print(vote);
           printf("%d   ",vote3);
           setCursor(14,1);
           sprintf(vote,"%d",vote4);
           print(vote);
           printf("%d   ",vote4);
           delay(2000);
         }
          digitalWrite(led2, LOW);
        }
        
       else if(vote3 > vote2 && vote3>vote1 && vote3>vote4)
        {
          digitalWrite(led3, HIGH);
         for(i=0;i<1;i++)
         {
          clear();
          setCursor(0,0);
          printf("Congratulations.......\n");
          print("Congratulations.......");
          setCursor(0,1);
          printf("P3 Won election\n");
          print("P3 Won election");
          delay(2000);
           clear();
           setCursor(0,0);
           printf("P1 P2 P3 P4\n");
           print("P1 P2 P3 P4");
           setCursor(1,1);
           sprintf(vote,"%d",vote1);
           print(vote);
           printf("%d   ",vote1);
           setCursor(6,1);
           sprintf(vote,"%d",vote2);
           print(vote);
           printf("%d   ",vote2);
           setCursor(10,1);
           sprintf(vote,"%d",vote3);
           print(vote);
           printf("%d   ",vote3);
           setCursor(14,1);
           sprintf(vote,"%d",vote4);
           print(vote);
           printf("%d   ",vote4);
           delay(2000);
         }
          digitalWrite(led3, LOW);
         
        }
        
        else if(vote4 > vote2 && vote4>vote3 && vote4>vote1)
        {
          digitalWrite(led4, HIGH);
         for(i=0;i<1;i++)
         {
          clear();
          setCursor(0,0);
          printf("Congratulations.......\n");
          print("Congratulations.......");
          setCursor(0,1);
          printf("P4 Won election\n");
          print("P4 Won election");
          delay(2000);
           clear();
           printf("P1 P2 P3 P4\n");
           print("P1 P2 P3 P4");
           setCursor(1,1);
           sprintf(vote,"%d",vote1);
           print(vote);
           printf("%d   ",vote1);
           setCursor(6,1);
           sprintf(vote,"%d",vote2);
           print(vote);
           printf("%d   ",vote2);
           setCursor(10,1);
           sprintf(vote,"%d",vote3);
           print(vote);
           printf("%d   ",vote3);
           setCursor(14,1);
           sprintf(vote,"%d",vote4);
           print(vote);
           printf("%d   ",vote4);
           delay(2000);
         }
          digitalWrite(led4, LOW);
        }
        
        else
        {
          for(i=0;i<1;i++)
         {
          clear();
          setCursor(0,0);
          printf("Tie Between Two\n");
          print("Tie Between Two");
          setCursor(0,1);
          printf("or more Parties\n");
          print("or more Parties");
          delay(2000);
           clear();
           printf("P1 P2 P3 P4\n");
           print("P1 P2 P3 P4");
           setCursor(1,1);
           sprintf(vote,"%d",vote1);
           print(vote);
           printf("%d   ",vote1);
           setCursor(6,1);
           sprintf(vote,"%d",vote2);
           print(vote);
           printf("%d   ",vote2);
           setCursor(10,1);
           sprintf(vote,"%d",vote3);
           print(vote);
           printf("%d   ",vote3);
           setCursor(14,1);
           sprintf(vote,"%d",vote4);
           print(vote);
           printf("%d   ",vote4);
           delay(2000);
         }
      }  

vote1=0;
vote2=0;
vote3=0;
vote4=0;
clear();
show();
}

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