easyC accel to velocity calculation...

VEX V5 General Discussion Technical Discussion
#1

hey guys
(or kingofl337, as you seem to be the only one responding, LOL)

i have a basic code laid out in easyC to convert the acceleration values from the accelerometer into velocity, shown below:

void main ( void )
{
      int accelerometery[6] = {0}; 
      int timestep = 1000; 
      int i = 0; 
      int velocity[6] = {0}; 

      InitAccelerometer ( 2 ) ; // initializes the accelerometer sensor
      Wait ( 1000 ) ;
      StartAccelerometer ( 2 ) ; // starts the sensor
      while ( 1 )
      {
            i = i + 1 ;
            accelerometery* = GetAcceleration ( 2 ) ; // reads feedback from the sensor
            velocity* = accelerometery* * timestep + velocity*  ;
            PrintToScreen ( "Accelerometery = %d mgs\n" , accelerometery[6] ) ; // displays the acceleration in milig's
            PrintToScreen ( "Velocity = %d\n" , velocity[6] ) ;
            Wait ( timestep  ) ;
      }
}

when i run the code to test, and keep the accelerometer absolutely still, i am getting these values:

https://lh3.googleusercontent.com/-SFVIqfudyq4/ToS3QeZZ7DI/AAAAAAAAAFE/0sDf6YWn3zY/s512/jumbo.JPG***

any idea / advice as to what is wrong or what i should fix? :confused:

thanks in advance.*

#2

Check this out, you need to filter the data to clean up your responce.

http://www.eee.hku.hk/~gpang/IARL/Publication/Mobile%20Robot.pdf

#3