File content as of revision 0:ffae044d3949:

#include "mbed.h"
#include "LIS302.h"
#include "MobileLCD.h"
#define pi 3.141592653589793238462643383279502884197

DigitalIn din (20);
MobileLCD lcd (5,6,7,8,9);
LIS302 acc (11,12,13,14);

//gloable Var's
float x; 
float y; 
float numx; 
float numy; 
float numxmid; 
float numymid; 
float xi; 
float yi;
//float d;

//Functions
float calculateangle(float, float);
float turnpos(float);
void display(void);
float average(float);

//Main Prog
int main() {

while (1) {

//read in from accelaromitor and filter the result
x = acc.x();
x= average(x);
y = acc.y();
y= average(y);

//Call calculate angle
numx = calculateangle(x,y);
numy = calculateangle(y,x);

//inverse direction of bubbles
numx *= -1;
numy *= -1;

//Button Press
if (din == 1)
{
	xi = numx ;
	yi = numy - 99;
}

numx -= xi;
numy -= yi;

//set bubble to middle
numxmid = ((numx/90)*130) + 64;
numymid = ((numy/90)*130) + 64;

//Turn negative numbers positive
numx = turnpos(numx);
numy = turnpos(numy);

//setup display
display();

}
}//End of main program


//angle calculations
float calculateangle(float i, float j)
{
float num;

	num = pi * 20 *(atan((i/j)));

return num;
}

//Turn Number Positive
float turnpos(float l)
{
if (l < 0)
{
	l *= -1;
}

return l;
}

//Set up Display
void display (void)
{
lcd.background(0x000000);

if (numy < 50)
{
	//black tollarence lines
	//xline
	lcd.fill (0, 8, 130, 1, 0xffffff);
	lcd.fill (60 , 0, 1, 8, 0xffffff);
	lcd.fill (70 , 0, 1, 8, 0xffffff);
	
	//x bubble
	lcd.fill (numymid , 2, 4, 4, 0x00ffbb);
}
	else	
	{
		//black tollarence lines
		//yline
		lcd.fill (8, 0, 1, 130, 0xffffff);
		lcd.fill (0, 60 , 8, 1, 0xffffff);
		lcd.fill (0, 70 , 8, 1, 0xffffff);
		
		//y bubble
		lcd.fill (2 , numxmid, 4, 4, 0xffbb00);
	}

//Display angle in middle of the screen
lcd.locate(3,7);
lcd.printf("Top  = %.0f ", numy);

lcd.locate(3,9);
lcd.printf("Left = %.0f ", numx);

//set refresh rate
wait(0.3);
lcd.cls();
}

//Digital Filter
float average(float i)
{
float av = 0;
for (int j=0; j < 50; j++)
{
av += i;
av /=50;
}
return av;
}