void SW_state(){
   //0-boot mode 
   //1-test mode don't know

    int p1=pressure[0]/100;
    int p2=pressure[1]/100;
    int p3=pressure[2]/100;

    float a1=altitudes[0];
    float a2=altitudes[1];
    float a3=altitudes[2];

//    if (p1==p2 && p2==p3 && a1==a2 && a2==a3)
      
      if (a1<=5.0 && a2<=5.0 && a3<=5.0){
      SWstate=2;//launch pad
//      s.write(180);
    }

    else if (p2<p1 && p3<p2 && a2>a1 && a3>a2 && a1>5.0 && a2>5.0 && a3>5.0) {
      SWstate=3; //Ascent
      
      if (a1>800.0 && a1<=900.0 && a3<a1 && p3>p1 ){
        //camera should start recording here
      ON_camera();
      SWstate=4; //Deployment
    }
    }
    
     else if (p2>p1 && p3>p2 && a2<a1 && a3<a2 && a1<800.0 && a2<800.0 && a3<800.0 ){
      SWstate=5; //Descent
      if (a3>=500.0){
      //ON_camera();
      s.write(180); //servo turns to deploy second parachute
      SWstate=6; //Aerobreak Release
//      if (p1==p2 && p2==p3 && a1==a2 && a2==a3)
      if (a1<5.0 && a2<5.0 && a3<5.0){
        SWstate=7;//Impact
        OFF_camera(); //camera stops recording here
        //buzzer should switch on here
      }
    }
    }

   packet+=String(SWstate);
   packet+=">\r";

}