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Im writing a program thats basically a g force meter.  so to make it more accurate i need to check the accelerometer about every 10-20 ms.  so i decided to try a timer interrupt.  when it enters the function it hangs on the chuck.update() command.  
excuse the code.  

im just trying to get a proof of concept.  


Code:
#include <math.h>
#include "Wire.h"
#include "WiiChuck.h"
#include "TimerOne.h"

WiiChuck chuck = WiiChuck();

float velocity =0;
float velocity_mph =0;
float velocity_acc =0;
float staccel =0;
float lataccel =0;
float gx=0;
float gy =0;

int pitch=0;
int roll=0;
int count=0;
long previous =0;

void setup(){
  delay(1000);
  Serial.begin(9600);
  chuck.begin();
chuck.update();
clearLCD();
selectLineOne();
Serial.print("ACCELEROMETER");
selectLineTwo();
Serial.print("-----READY-----");
delay(1000);
//Timer1.initialize(500000);
// Timer1.attachInterrupt(callback);

}
int num =1;
void callback(){
  help();
 chuck.update();
}
void help(){
   digitalWrite(13,num);
  if(num==1)num=0;
  else num=1;
  
}



void loop(){
 if(millis()-previous >200){
    previous = millis();
   Print();
}
}  
void Print(){
  clearLCD();
  selectLineOne();
  Serial.print(" ST:");
  printDouble(gx,1000);
  Serial.print(" ");
  Serial.print(roll);
  Serial.print(" ");
  printDouble(velocity_mph,10);
  
  selectLineTwo();
  Serial.print("LAT:");
  printDouble(gy,1000);
  Serial.print(" ");
  Serial.print(pitch);
}


void get_data(){

  chuck.update();
  
  staccel+=chuck.readAccelX()/204;
  lataccel+=chuck.readAccelY()/204;
  count++;
 
  velocity_acc = (staccel/50)*9.81;
  velocity = velocity + velocity_acc;
  velocity_mph = velocity * 2.23693629;
  
  if(count> 5){
  count = 0;
  gx =  staccel / 5;
  gy = lataccel / 5;
  staccel =0;
  lataccel=0;
  
    };
  
 
  
  
  
  
}

  








void selectLineOne(){  //puts the cursor at line 0 char 0.
   Serial.print(0xFE, BYTE);   //command flag
   Serial.print(128, BYTE);    //position
}
void selectLineTwo(){  //puts the cursor at line 0 char 0.
   Serial.print(0xFE, BYTE);   //command flag
   Serial.print(192, BYTE);    //position
}
void clearLCD(){
   Serial.print(0xFE, BYTE);   //command flag
   Serial.print(0x01, BYTE);   //clear command.
}
void backlightOn(){  //turns on the backlight
      Serial.print(0x7C, BYTE);   //command flag for backlight stuff
      Serial.print(157, BYTE);    //light level.
}
void backlightOff(){  //turns off the backlight
      Serial.print(0x7C, BYTE);   //command flag for backlight stuff
      Serial.print(128, BYTE);     //light level for off.
}
void serCommand(){   //a general function to call the command flag for issuing all other commands  
      Serial.print(0xFE, BYTE);
}
void backlight(int val){  //turns on the backlight
      val=val+128;                 // turn it to amounts understood by lcd
      Serial.print(0x7C, BYTE);   //command flag for backlight stuff
      Serial.print(val, BYTE);    //light level.
}
void selectcursor(int val1, int val2){    // val1 = line val2 = position
      int val= 128+val2+64*val1;
      Serial.print(0xFE, BYTE);   //command flag
   Serial.print(val, BYTE);    //position
}
void printDouble( double val, unsigned int precision){
      // prints val with number of decimal places determine by precision
      // NOTE: precision is 1 followed by the number of zeros for the desired number of decimial places
      // example: printDouble( 3.1415, 100); // prints 3.14 (two decimal places)
      
      Serial.print (int(val));  //prints the int part
      Serial.print("."); // print the decimal point
      unsigned int frac;
      if(val >= 0)
            frac = (val - int(val)) * precision;
      else
            frac = (int(val)- val ) * precision;
      
      if(frac <100)Serial.print(0);
      if(frac <10)Serial.print(0);
      Serial.print(frac,DEC) ;
}


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