#include<LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);

#define ds_col 15
#define sh_col 16
#define st_col 14
#define ds_row 17

#define start 3
#define up 2
#define down 5
#define left 4
#define right 6

char Col[21],Row[21],move_c,move_r;
int colum_data(int temp)
{
switch(temp)
{
case 1: return 1;break;
case 2: return 2; break;
case 3: return 4; break;
case 4: return 8; break;
case 5: return 16; break;
case 6: return 32; break;
case 7: return 64; break;
case 8: return 128; break;
default: return 0; break;
}
}

int row_data(int temp)
{
switch(temp)
{
case 1: return 1;break;
case 2: return 2; break;
case 3: return 4; break;
case 4: return 8; break;
case 5: return 16; break;
case 6: return 32; break;
case 7: return 64; break;
case 8: return 128; break;
default: return 0; break;
}
}

void read_button()
{
if(!digitalRead(left))
{
move_r=0;
move_c!=-1 ? move_c=-1 : move_c=1;
while(!digitalRead(left));
}

 if(!digitalRead(right))
{
move_r=0;
move_c!=1 ? move_c=1 : move_c=-1;
while(!digitalRead(right));
}

 if(!digitalRead(up))
{
move_c=0;
move_r!=-1 ? move_r=-1 : move_r=1;
while(!digitalRead(up));
}

 if(!digitalRead(down))
{
move_c=0;
move_r!=1 ? move_r=1 : move_r=-1;
while(!digitalRead(down));
}
}

void show_snake(int temp)
{
for(int n=0;n<temp;n++)
{
int r,c;
for(int k=0;k<21;k++)
{
int temp1=Col[k];
c=colum_data(temp1);
int temp2=Row[k];
r=0xff-row_data(temp2);
for(int i=0;i<8;i++)
{
int ds=(c & 0x01);
digitalWrite(ds_col, ds);
ds=(r & 0x01);
digitalWrite(ds_row, ds);
digitalWrite(sh_col, HIGH);
c>>=1;
r>>=1;
digitalWrite(sh_col, LOW);
}
digitalWrite(st_col, HIGH);
digitalWrite(st_col, LOW);
read_button();
delayMicroseconds(500);
}
}
}

void setup()
{
lcd.begin(16,2);
pinMode(ds_col, OUTPUT);
pinMode(sh_col, OUTPUT);
pinMode(st_col, OUTPUT);
pinMode(ds_row, OUTPUT);
pinMode(start, INPUT);
pinMode(up, INPUT);
pinMode(down, INPUT);
pinMode(left, INPUT);
pinMode(right, INPUT);
digitalWrite(up, HIGH);
digitalWrite(down, HIGH);
digitalWrite(left, HIGH);
digitalWrite(right, HIGH);
digitalWrite(start, HIGH);
lcd.setCursor(0,0);
lcd.print(”  Snake game    “);
lcd.setCursor(0,1);
lcd.print(“Circuit Digest  “);
delay(2000);
lcd.setCursor(0,0);
lcd.print(”   Press Start  “);
lcd.setCursor(0,1);
lcd.print(”     To Play    “);
delay(2000);
}

void loop()
{
int j,k,Speed=40,score=0;
j=k=move_c=0;
move_r=1;
lcd.clear();
lcd.setCursor(0,0);
lcd.print(“Score: “);
lcd.print(score);
while(1)
{
for(int i=3;i<21;i++)
{
Row[i]=100;
Col[i]=100;
}
Row[0]=rand()%8+1;
Col[0]=rand()%8+1;
Row[1]=1;
Col[1]=1;
Row[2]=2;
Col[2]=1;
j=2,k=1;
while(k==1)
{
move_c=0;
move_r=1;
show_snake(1);
lcd.setCursor(7,0);
lcd.print(score);
if(!digitalRead(start))
{
k=2;
Speed=40;
score=0;
}
}

while(k==2)
{
show_snake(Speed);
if(Row[1]>8 || Col[1]>8 || Row[1]<0 || Col[1]<0)
{
Row[1]=1;
Col[1]=1;
k=1;
lcd.setCursor(0,1);
lcd.print(“Game Over”);
delay(5000);
score=0;
lcd.clear();
lcd.setCursor(0,0);
lcd.print(“Score: “);
lcd.print(score);
}

        if(Row[0]==Row[1]+move_r  &&  Col[0]==Col[1]+move_c)
{
j++;
Speed-=2;
score=score+5;
lcd.setCursor(7,0);
lcd.print(score);
Row[0]=rand()%8+1;
Col[0]=rand()%8+1;
}

  for(int i=j;i>1;i–)
{
Col[i]=Col[i-1];
Row[i]=Row[i-1];
}
Col[1]=Col[2]+move_c;
Row[1]=Row[2]+move_r;
}
}
}