bike alarm

#include <Wire.h>
#include <Adafruit_Sensor.h> 
#include <Adafruit_ADXL345_U.h>

int ledr = 13;
int b1 = 2;
double fXg = 0;
double fYg = 0;
double fZg = 0;
double roll;
double pitch;
const float alpha = 0.5;
 const int sens = 7;

Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified();

void setup(void) 
{
  pinMode(ledr, OUTPUT);
  pinMode (b1, OUTPUT);  
  
   Serial.begin(9600);  
   if(!accel.begin())
   {
      Serial.println("No ADXL345 sensor detected.");
      while(1);
   }


  digitalWrite(ledr, HIGH);
  digitalWrite(b1,HIGH);
  delay(500);
  digitalWrite(ledr, LOW);
  digitalWrite(b1, LOW);


   
}


int get_roll(void){
 // Get a new sensor event 

 sensors_event_t event; 
 accel.getEvent(&event);
   

    fXg = event.acceleration.x * alpha + (fXg * (1.0 - alpha));
    fYg = event.acceleration.y * alpha + (fYg * (1.0 - alpha));
    fZg = event.acceleration.z * alpha + (fZg * (1.0 - alpha));
 
    //Roll & Pitch Equations
    roll  = (atan2(-fYg, fZg)*180.0)/M_PI;

 return roll;

}

int get_pitch(void){
 // Get a new sensor event 

 sensors_event_t event; 
 accel.getEvent(&event);
   

    fXg = event.acceleration.x * alpha + (fXg * (1.0 - alpha));
    fYg = event.acceleration.y * alpha + (fYg * (1.0 - alpha));
    fZg = event.acceleration.z * alpha + (fZg * (1.0 - alpha));
 
    //Roll & Pitch Equations

    pitch = (atan2(fXg, sqrt(fYg*fYg + fZg*fZg))*180.0)/M_PI;

 return pitch;

}


void loop(void) 
{
   
    int oldRoll = get_roll();
    int oldPitch =get_pitch();
    Serial.print("roll:");Serial.print(oldRoll);
    Serial.print("pitch:");Serial.println(oldPitch);
   sensors_event_t event; 
   accel.getEvent(&event);

   Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print("  ");
   Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print("  ");
   Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.print("  ");
   delay(500);

      int NewRoll = get_roll();
    int NewPitch =get_pitch();

if (NewRoll < (oldRoll-sens) && oldRoll != 0 && NewRoll != 0) {
   // sound the alarm 
    sirena_policia(); 

 }else if (NewRoll > (oldRoll+sens) && oldRoll!= 0 && NewRoll != 0) {
   // sound the alarm 
    sirena_policia(); 

 }

 
if (NewPitch < (oldPitch-sens) && oldPitch != 0 && NewPitch != 0) {
   // sound the alarm 
    sirena_policia(); 

  

 }else if (NewPitch > (oldPitch+sens) && oldPitch!= 0 && NewPitch != 0) {
   // sound the alarm 

  
  sirena_policia();

 }

    
   
}


void sirena_policia() {                             //This function produces the 4th siren(POLICE) sound with led transition.
for(int i=2;i<=10;i+=2)
digitalWrite(i,HIGH);
  for(int hz = 440; hz < 1000; hz++){
    tone(b1, hz, 50);
    delay(5);
  }
for(int i=2;i<=10;i+=2)
digitalWrite(i,LOW);
 for(int i=4;i<=12;i+=2)
digitalWrite(i,HIGH);
  for(int hz = 1000; hz > 440; hz--){
    tone(b1, hz, 50);
    delay(5);
    }
  }