Hi Please Help!!!
I saw a few weeks ago an advertisement on the Arduino website to make a retro nokia 5110 snake game.
I went and bought all the kit
A Nokia 5110 screen
A joystick
and Arduino Uno
The parts came from China. By the time they arrived the Code (which I did not download has been removed 
)
I have found code to run the snake on the screen but with 4 push buttons. I would like to change the code so it can read a joy stick.
Below is the 4 button code any hep will be gratefully received.
#include <EEPROM.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>
Adafruit_PCD8544 display = Adafruit_PCD8544(7, 6, 5, 4, 3); //Initialise display object
// pin 7 - Serial clock out (SCLK)
// pin 6 - Serial data out (DIN)
// pin 5 - Data/Command select (D/C)
// pin 4 - LCD chip select (CS)
// pin 3 - LCD reset (RST)
/********* constants *******/
#define LEFT 8
#define DOWN 10
#define RIGHT 11
#define UP 12
#define PAUSE 9
#define MAX_WIDTH 84 //display 84x48
#define MAX_HEIGHT 48
#define speakerPin 2
boolean dl=false,dr=false,du=false,dd=false; // to check in which direction the snake is currently moving
int x[200],y[200],i,slength,tempx=10,tempy=10,xx,yy;
unsigned int high;
uint8_t bh,bl;
int xegg,yegg;
int freq,tb;
int l,r,u,d,p;
unsigned long time=280,beeptime=50;
int score=0,flag=0;
void setup()
{
Serial.begin(9600); //Begin Serial Communication
display.begin();
display.clearDisplay();
pinMode(LEFT,INPUT); //Directional keys and pause
pinMode(RIGHT,INPUT);
pinMode(UP,INPUT);
pinMode(DOWN,INPUT);
pinMode(PAUSE,INPUT);
pinMode(speakerPin,OUTPUT); //Buzzer pin
digitalWrite(LEFT,HIGH); //Active low keys
digitalWrite(RIGHT,HIGH);
digitalWrite(UP,HIGH);
digitalWrite(DOWN,HIGH);
digitalWrite(PAUSE,HIGH);
display.setContrast(25);
slength=8; //Start with snake length 8
xegg=(display.width())/2;
yegg=(display.height())/2;
display.setTextSize(2); //Initial Display
display.setTextColor(BLACK);
display.setCursor(10,15);
display.print("rishabh");
display.setCursor(10,40);
display.print("jjjj");
display.display();
delay(4000);
display.clearDisplay();
for(i=0;i<=slength;i++) //Set starting coordinates of snake
{
x_=25-3i;_
_ y=10; _
_ }*_
* for(i=0;i<slength;i++) //Draw the snake*
* {*
display.drawCircle(x_,y*,1,BLACK);
}
display.display();
dr=true; //Going to move right initially
}
//Movement Begins after here*
void loop()
{_
* movesnake(); //This is called endlessly*
}
void movesnake()
{
* l=digitalRead(LEFT); //Continuously Check the Keys*
* d=digitalRead(DOWN);*
* r=digitalRead(RIGHT);*
* u=digitalRead(UP);*
* p=digitalRead(PAUSE);*
if(flag==0)
{
direct(); //When key is pressed,this will change the coordinates accordingly and set flag to 1
* //flag would be set to 1 so that direction is not changed multiple times in a short duration*
}
* if(millis()%time==0) //this condition becomes true after every 'time' milliseconds...millis() returns the time since launch of program*
{
* if(flag==0) //flag 0 means no directional key has been pressed in the last 'time' milliseconds*
* {*
* if(dr==true){tempx=x[0]+3;tempy=y[0];} // so the snake moves one step in the direction it is moving currently*
* if(dl==true){tempx=x[0]-3;tempy=y[0];} //The new coordinates of head of snake goes in tempx,tempy*
* if(du==true){tempy=y[0]-3;tempx=x[0];}*
* if(dd==true){tempy=y[0]+3;tempx=x[0];}*
* }*
* flag=0; *
* checkgame(); //Check if snake has met egg or coincided with itself*
* checkegg();*
if(tempx<=0){tempx=84+tempx;} //If the new coordinates are out of screen, set them accordingly
if(tempx>=84){tempx=tempx-84;}
if(tempy<=0){tempy=48+tempy;}
if(tempy>=48){tempy=tempy-48;}
for(i=0;i<=slength;i++) //Change the coordinates of all points of snake
* {*
_ xx=x*;
yy=y;
x=tempx;
y=tempy;
tempx=xx;
tempy=yy;
}*_
drawsnake(); //Draw the snake and egg at the new coordinates
}
}
void checkgame() //Game over checker
{
* for(i=1;i<slength;i++) //Checking if the coordinates of head have become equal to one of the non head points of snake*
* {*
if(x_==x[0] && y*==y[0])
{*_
* bh=EEPROM.read(1);*
* bl=EEPROM.read(0);*
* high=(((0xff00+bh)<<8) + bl);*
* if(score>high)*
* {*
* high=score;*
* bh=(high >> 8);*
* bl=high & 0xff;*
* EEPROM.write(1,bh);*
* EEPROM.write(0,bl);*
* }*
* display.clearDisplay();*
* display.setTextColor(BLACK); *
* display.setTextSize(1);*
* display.setCursor(20,12);*
* display.print("Game Over");*
* display.setCursor(15,30);*
* display.print("Score: ");*
* display.print(score);*
* display.setCursor(15,40);*
* display.print("High: ");*
* display.print(high);*
* display.display();*
* beep(20,5000);*
* display.clearDisplay();*
* slength=8; //Resetting the values*
* score=0;*
* time=280;*
* redraw(); //Restart game by drawing snake with the resetted length and score*
* }*
* }*
}
void checkegg() //Snake meets egg
{
* if(x[0]==xegg or x[0]==(xegg+1) or x[0]==(xegg+2) or x[0]==(xegg-1)) //Snake in close vicinity of egg*
* {*
* if(y[0]==yegg or y[0]==(yegg+1) or y[0]==(yegg+2) or y[0]==(yegg-1))*
* {*
* score+=1; //Increase length,score and increase movement speed by decreasing 'time'*
* slength+=1;*
* if(time>=90)*
* {time-=20;}*
* display.fillRect(xegg,yegg,3,3,WHITE); //Delete the consumed egg*
* display.display();*
* beep(35,beeptime); //Beep with a sound of 35Hz for 'beeptime' ms*
* xegg=random(1,80); //Create New egg randomly*
* yegg=random(1,40);*
* }*
* }*
*} *
void direct() //Check if user pressed any keys and change direction if so
{
* if(l==LOW and dr==false) //when key LEFT is pressed ,L will become low*
* {*
* dl=true;du=false;dd=false;*
* tempx=x[0]-3; //Save the new coordinates of head in tempx,tempy*
* tempy=y[0];*
* flag=1; //Do not change direction any further for the ongoing 'time' milliseconds*
* } *
* else if(r==LOW and dl==false)*
* {*
* dr=true;du=false;dd=false;*
* tempx=x[0]+3;*
* tempy=y[0];*
* flag=1;*
* } *
* else if(u==LOW and dd==false)*
* {*
* du=true;dl=false;dr=false;*
* tempy=y[0]-3;*
* tempx=x[0];*
* flag=1;*
* } *
* else if(d==LOW and du==false)*
* {*
* dd=true;dl=false;dr=false;*
* tempy=y[0]+3;*
* tempx=x[0];*
* flag=1;*
* }*
* else if(p==LOW) //Pause game for 5 seconds*
* {*
* display.clearDisplay();*
* display.setTextColor(BLACK);*
* for(i=5;i>0;i--)*
* {*
* display.setCursor(25,10);*
* display.setTextSize(1);*
* display.print("PAUSED");*
* display.setCursor(40,30);*
* display.print(i);*
* display.display();*
* delay(1000);*
* display.clearDisplay();*
* }*
* redraw(); //Redraw the snake and egg at the same position as it was*
* }*
}
void drawsnake() //Draw snake and egg at newly changed positions
{
* display.fillRect(xegg,yegg,3,3,BLACK); //Draw egg at new pos*
* display.drawCircle(x[0],y[0],1,BLACK); //Draw new head of snake*
* display.drawCircle(x[slength],y[slength],1,WHITE); //Delete old tail of snake*
* display.display();*
}
void redraw() //Redraw ALL POINTS of snake and egg
{
* display.fillRect(xegg,yegg,3,3,BLACK);*
* for(i=0;i<slength;i++)*
* {*
display.drawCircle(x_,y*,1,BLACK);*_
* }*
* display.display();*
*} *
void beep (int freq,long tb) //This function creates a sound of frequency 'freq' Hz and for a duration of 'tb' milliseconds
{
* int x; *
* long delayAmount = (long)(500/freq); //Calculate time duration of half cycle*
_ long loopTime = (long)(tb/(delayAmount2)); //Calculate no. of cycles_
_ for (x=0;x<loopTime;x++) // One iteration produces sound for one cycle*
* {
digitalWrite(speakerPin,HIGH); //High for half cycle*
* delay(delayAmount);
digitalWrite(speakerPin,LOW); //Low for half cycle*
* delay(delayAmount);
} *_
* delay(2);*
* //a little delay to make all notes sound separate*
*} *