int redPin = 9;
int greenPin = 10;
int bluePin = 11;
float s4 =0;

unsigned long res=0;

#define an A0

float value=0;

long n4 =0;

#define echopin 12
#define trigpin 8
int maximumrange = 50;
long duration,distance;

int buzzerpin=7;

float bz4(){
  tone(buzzerpin,300);//plays 262Hz tone for 0.250 seconds
  delay(100);
  noTone(buzzerpin);
   delay(100);
}


void nawaf(){
Serial.begin (9600);
 pinMode (echopin,INPUT);
 pinMode (trigpin,OUTPUT);
 pinMode (2,OUTPUT);
 pinMode (3,OUTPUT);
 pinMode (4,OUTPUT);
 pinMode (5,OUTPUT);
 pinMode (6,OUTPUT);
 pinMode (7,OUTPUT);
 pinMode (8,OUTPUT);
 pinMode (11,OUTPUT);
 pinMode (12,OUTPUT);
 pinMode (13,OUTPUT);
 pinMode (A0,OUTPUT);
 pinMode (A1,OUTPUT);
 pinMode (A2,OUTPUT);
 pinMode (A3,OUTPUT);
  pinMode(buzzerpin, OUTPUT);
}

long Ult(){
 digitalWrite(trigpin,LOW);
  delayMicroseconds(2);
  
 digitalWrite(trigpin,HIGH);
 delayMicroseconds(10); 

 duration=pulseIn (echopin,HIGH);
 distance = duration/58.2; 

 
 
return distance;



}


float LDR (){

   value=analogRead(an);
  value=(value/1023)*5;
  res=(1000*value)/(5-value);
//  // Serial.println(res);
//   if(res>=30000)
//   {
//     digitalWrite(led,HIGH);
//   }else digitalWrite(led,LOW);
  

return  value;

}

void setColor(int red, int green, int blue){
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);  
}
void LED_on (){

 
  setColor(255, 50, 0);  // Orange
 
 


}

void LED_off (){

 
 setColor(0, 0, 0);  // red lowest brightness
 // delay(1000);

 


}

void setup() {
  Serial.begin (9600);
 pinMode (echopin,INPUT);
 pinMode (trigpin,OUTPUT);
 
  pinMode(buzzerpin, OUTPUT);

 pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);  


  pinMode(an,INPUT);

//nawaf();
}

void loop() {


s4 = LDR();

 

  n4 = Ult();


  if(n4 < 20){

  bz4();
  }
  
  if(s4 > 4.5){

 LED_on();

  }else
  {
LED_off();

  }


Serial.println(s4);

//Serial.println(n4);


}