#include<math.h>
#include<stdio.h>


#define A_Z  1
#define LED  4

int val_z,val_pre;
//double b;
void setup()
{

  pinMode(A_Z,INPUT);
  pinMode(LED, OUTPUT);

Serial.swap(1);//for updi ftdi 
  Serial.begin(19200);
    for (int i=0;i<50;i++)
  {

    val_z+=analogRead(A_Z);
  }
  

   val_z=val_z/50;
   val_pre=val_z;
}


void loop()
{
   for (int i=0;i<50;i++)
  {

    val_z+=analogRead(A_Z);
  }
  
   val_z=val_z/50;

   delay(300);
   Serial.print(" Z_Axis: ");
   Serial.print(val_z);
   Serial.println(" ");
 
// add led /  /

if (val_z<(val_pre+2)&&val_z>(val_pre-2)) {
      // turn LED off:
    digitalWrite(LED, LOW);
   Serial.println(val_pre);
  } else {
    // turn LED on:
    digitalWrite(LED, HIGH);
    delay(1000);                       // wait for a second and blink
    digitalWrite(LED, LOW);
    delay(1000); 
        digitalWrite(LED, HIGH);
    delay(1000);                       // wait for a second and blink
    digitalWrite(LED, LOW);
    delay(1000); 
        digitalWrite(LED, HIGH);
    delay(1000);                       // wait for a second and blink
    digitalWrite(LED, LOW);
    delay(1000); 
    val_pre=val_z;
  }

// end of led //  

}