// Smart belt for Blind People //
const int trigPin = 2; //D4

const int echoPin = 0; //D3

const int buzzer = 13; //D7

long duration;

int distance;

int safetyDistance;

void setup() {

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(buzzer, 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;

safetyDistance = distance; 

if (safetyDistance <= 10)
{

digitalWrite(buzzer, HIGH);

}

else{

digitalWrite(buzzer, LOW);

}