// define constant part ******************
const int TrigPin = 10 ;
const int EchoPin = 8 ; 
const int Red = 5 ;
const int Blue = 3 ; 
const int Green = 4 ;
const int Speaker = 2 ;
const int TimeDelay = 100 ;
const int WorkingHzSiganl = 500 ;
unsigned long PreviousValue = 0 ;
bool IsSpeakerOn = false ;
const int DataPin = 6 ;
const int LatchPin = 7 ;
const int clock = 9 ;

// functions code  ***********************
void SevenSigment(long distance)
{
  






  



}



enum SegLetter()
{
  seg_a = 0b10000000, seg_b = 0b00100000, seg_c = 0b00001000,
  seg_d = 0b00000010, seg_e = 0b00000001, seg_f = 0b01000000,
  seg_g = 0b00010000, seg_dp = 0b00000100
}


const uint8_t SegMap[]=
{
  seg_a | seg_b | seg_c | seg_d | seg_e | seg_f, // 0
  seg_b | seg_c, // 1
  seg_a | seg_b | seg_g | seg_e | seg_d, // 2
  seg_a | seg_b | seg_g | seg_c | seg_d, // 3
  seg_f | seg_g | seg_b | seg_c, // 4
  seg_a | seg_f | seg_g | seg_c | seg_d, // 5
  seg_a | seg_f | seg_e | seg_d | seg_c | seg_g, // 6
  seg_a | seg_b | seg_c, // 7
  seg_a | seg_b | seg_c | seg_d | seg_e | seg_f | seg_g, // 8
  seg_a | seg_b | seg_c | seg_d | seg_f | seg_g, // 9

  seg_e | seg_f | seg_a | seg_b | seg_c | seg_g, // A
  seg_f | seg_e | seg_d | seg_c | seg_g, // b
  seg_g | seg_e | seg_d, // c
  seg_g | seg_e | seg_d | seg_c | seg_b, // d
  seg_a | seg_f | seg_g | seg_e | seg_d, // E
  seg_a | seg_f | seg_g | seg_e, // F

}



void speaker_duraiton(long distance)
{
  unsigned long temp = map( distance , 1 , 400 , 50 , 1000) ;
  unsigned long CurrentValue = millis() ;
if( temp <= CurrentValue - PreviousValue ){
PreviousValue = CurrentValue ;
if( IsSpeakerOn == false ){
  tone( Speaker , WorkingHzSiganl ) ;
  IsSpeakerOn = true ;
}else{
  noTone( Speaker ) ;
  IsSpeakerOn = false ;
}
}
}



long RangeCm(long duration)
{
  if( IsSpeakerOn == true ){
  int temp1 = map( duration / 58 , 2 , 400 , 0 , 4 ) ;
  return duration / 58 + temp1 ;
  }
 else{
    return duration / 58 ;
  }
}


void RGB( long distance )
{
if( distance <= 50 ){
 digitalWrite( Green , LOW ) ;
 digitalWrite( Red , HIGH ) ;
}else if( distance > 50 && distance <= 250 ){
 digitalWrite( Red , HIGH ) ;
 digitalWrite( Green , HIGH ) ;
}else
 {
 digitalWrite( Red , LOW );
 }
}

// main code **********************************


void setup() {
Serial.begin( 9600 ); // start to reading from the sensor 
pinMode( TrigPin , OUTPUT ); // define pin 10 as an output
pinMode( EchoPin , INPUT ); // define pin 8 as an input
pinMode( Speaker , OUTPUT ) ;
pinMode( Red , OUTPUT ) ; 
pinMode( Green , OUTPUT ) ;
pinMode( Blue , OUTPUT ) ;
}

void loop() {

 // giving clock for the trig at least 10 micro sec 

  digitalWrite( TrigPin , HIGH) ; 
  delayMicroseconds( 10 ) ;
  digitalWrite( TrigPin , LOW ) ; 

  // read the input from the sensor
  long duration = pulseIn( EchoPin , HIGH ) ;
  //calculate the distance in cm
  long distance = RangeCm( duration ) ;

  // print distance in cm to the user 
  Serial.print( "distance in cm : " ) ;
  Serial.print( distance ) ;
  Serial.println() ;

 // rgb change by color change by distance
  RGB( distance ) ;

// distance speaker indicates near by objects (slow = far ,fast = close) 
  speaker_duraiton( distance );

// display on the sevensigment
  //SevenSigment(distance);


}