#include<wiringPi.h>
#include <wiringSerial.h>
#include<stdio.h>
#include <string.h>
#define RS 11
#define EN 10
#define D4 6
#define D5 5
#define D6 4
#define D7 1
#define led1 26
#define led2 27
#define led3 28
#define led4 29
#define buzz 0
#define d1 25
#define d2 24
#define d3 23
#define d4 22
int flag1=0,flag2=0,flag3=0,flag4=0;
  void lcdcmd(unsigned int 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 int 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(char *str)
  {
    while(*str)
    {
     write(*str);
     str++;
    }
  }
  void begin(int x, int y)
  {
    lcdcmd(0x02);
    lcdcmd(0x28);
    lcdcmd(0x06);
    lcdcmd(0x0e);
    lcdcmd(0x01);
  }
  
 void buzzer()
{
     digitalWrite(buzz, HIGH);
     delay(1000);
     digitalWrite(buzz, LOW);
}
  void setup()
{
   if (wiringPiSetup () == -1)
   {
     clear();
     print("Unable to start"); 
     setCursor(0,1);
     print("wiringPi");
   }
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(buzz, OUTPUT);
  pinMode(RS, OUTPUT);
  pinMode(EN, OUTPUT);
  pinMode(D4, OUTPUT);
  pinMode(D5, OUTPUT);
  pinMode(D6, OUTPUT);
  pinMode(D7, OUTPUT);
  pinMode(d1, INPUT);
  pinMode(d2, INPUT);
  pinMode(d3, INPUT);
  pinMode(d4, INPUT);
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(buzz, LOW);
  begin(16,2);
}
//void loop()
void main()
{
   setup();
   clear();
   print("  RF Module ");
   setCursor(0,1);
   print(" Interfacing ");
   delay(2000);
   clear();
   print("Raspberry Pi");
   setCursor(0,1);
   print("Circuit Digest");
   delay(2000);
   clear();
   print("System Ready");
   delay(1000);
   clear();
  setCursor(0,1);
  print("OFF OFF OFF OFF");
   while(1)
   {
        setCursor(0,0);
        print("D1  D2  D3  D4");
        if(digitalRead(d1)==0)
        {
          flag1++;
          setCursor(0,1);
          if(flag1%2==1)
          {
            print("ON ");
            digitalWrite(led1,HIGH);
          }
          else
          {
            print("OFF");
            digitalWrite(led1,LOW);
          }
          buzzer();
          while(digitalRead(d1)==0);
        }
        else if(digitalRead(d2)==0)
        {
          flag2++;
          setCursor(4,1);
          if(flag2%2==1)
          {
            print("ON ");
            digitalWrite(led2,HIGH);
          }
          else
          {
            print("OFF");
            digitalWrite(led2,LOW);
          }
          buzzer();
          while(digitalRead(d2)==0);
        }
         else if(digitalRead(d3)==0)
        {
          flag3++;
          setCursor(8,1);
          if(flag3%2==1)
          { 
            print("ON ");
            digitalWrite(led3,HIGH);
          }
          else
          {
            print("OFF");
            digitalWrite(led3,LOW);
          }
         buzzer();
          while(digitalRead(d3)==0);
        }
        else if(digitalRead(d4)==0)
        {
          flag4++;
          setCursor(12,1);
          if(flag4%2==1)
          {
            print("ON ");
            digitalWrite(led4,HIGH);
          }
          else
          {
            print("OFF");
            digitalWrite(led4,LOW);
          }
          buzzer();
          while(digitalRead(d4)==0);
        }
}
}