PROGRAMMING VELOCITY (EARLY WARNING FAULT DETECTION SYSTEM)

Coding for checking velocity.

int hits = 0;

float wheel_radius = 1;

volatile unsigned int current_time;

long time_interval = 1000; //how often do you want to know velocity (milliseconds)

float velocity; //this is the velocity in length units / time_interval

void setup ()

{

  Serial.begin(9600);

  attachInterrupt(0, count, CHANGE);

  current_time = millis();

}

void loop ()

{

     if ( millis() >= current_time + time_interval)

    {

    

     velocity = (hits*(wheel_radius * 392.7))/time_interval;//the     constant is 2*pi*1000/16

     Serial.println(velocity);

     hits = 0;

     current_time = millis();

  }

}  

void count()

{

 hits++;

}