Smart walking stick for blind

const byte trigPin = 3; //Trigger pin of 1st Sesnor
const byte echoPin = 2; //Echo pin of 1st Sesnor
const int Buzz = 13; //Echo pin of 1st Sesnor
//const int Remote = A0; //Echo pin of 1st Sesnor
const int Light = A1; //Echo pin of 1st Sesnor
const int Water = A4;
const int led = 5;

unsigned long distance;
unsigned long duration;
//int Signal;
int Intens;
//int similar_count;
int WS;
int freq = 50;

void setup() {

pinMode(Buzz,OUTPUT);
digitalWrite(Buzz,LOW);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(Water, INPUT);
pinMode(Light, INPUT);
pinMode(led, OUTPUT);
Serial.begin(9600);
}


void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  if (distance<30)

  {
    Serial.println("Object Alert");
    Serial.print("Distance: ");
    Serial.println(distance);
    int i=0;
    do
    {
      i++;
      tone(Buzz, 450);
      delay(200);
      noTone(Buzz);
      delay(200);   
    }while(i<2);
    delay(3000);
  }


//Signal = analogRead(Remote);
  Intens = analogRead(Light);

  if (Intens<=300)
  {
    digitalWrite(led, HIGH);
    Serial.print(Intens);
    Serial.println("Low Light");
    int j=0;
    do
    {
      j++;
      tone(Buzz, 450);
      delay(200);
      noTone(Buzz);
      delay(200);
    }while(j<3);
    delay(3000);
  }




//Check if Remote is pressed
/*int temp = analogRead(Remote);
similar_count=0;
while (Signal==temp)
{
Signal = analogRead(Remote);
similar_count++;
}*/

//If remote pressed
/*if (similar_count<100)
{
  Serial.print(similar_count); Serial.println("Remote Pressed");
  digitalWrite(Buzz,HIGH);delay(3000);digitalWrite(Buzz,LOW);
}*/

//If very dark

  WS = analogRead(Water);
  if (WS > 200)
  {
    Serial.println("Water presence");
    Serial.print("Water : ");
    Serial.println(WS);
    int z=0;
    do
    {
      z++;
      tone(Buzz, 450);
      delay(200);
      noTone(Buzz);
      delay(200);
    }while(z<4);
    delay(3000);
  }


//Serial.print("dist=");
//Serial.println(cm);
//Serial.print("Similar_count=");
// Serial.println(similar_count);
//Serial.print("Intens=");
//Serial.println(Intens);
//Serial.print("Water");
//Serial.println(WS);
}