//

int distance = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)

{

  pinMode(triggerPin, OUTPUT);  // Clear the trigger

  digitalWrite(triggerPin, LOW);

  delayMicroseconds(2);

  // Sets the trigger pin to HIGH state for 10 microseconds

  digitalWrite(triggerPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  pinMode(echoPin, INPUT);

  // Reads the echo pin, and returns the sound wave travel time in microseconds

  return pulseIn(echoPin, HIGH);

}

void setup()

{

  Serial.begin(9600);

  pinMode(5, OUTPUT);

  pinMode(4, OUTPUT);

}

void loop()

{

  distance = 0.01723 * readUltrasonicDistance(9, 8);

  Serial.println(distance);

  delay(500); // Wait for 500 millisecond(s)

  if (distance <= 100) {

    digitalWrite(5, HIGH);

    digitalWrite(4, HIGH);

  } else {

    digitalWrite(5, HIGH);

    digitalWrite(4, LOW);

  }

}

//

int distance = 0;

 

long readUltrasonicDistance(int triggerPin, int echoPin)

{

  pinMode(triggerPin, OUTPUT);  // Clear the trigger

  digitalWrite(triggerPin, LOW);

  delayMicroseconds(2);

  // Sets the trigger pin to HIGH state for 10 microseconds

  digitalWrite(triggerPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  pinMode(echoPin, INPUT);

  // Reads the echo pin, and returns the sound wave travel time in microseconds

  return pulseIn(echoPin, HIGH);

}

 

void setup()

{

  Serial.begin(9600);

 

  pinMode(5, OUTPUT);

  pinMode(4, OUTPUT);

}

 

void loop()

{

  distance = 0.01723 * readUltrasonicDistance(9, 8);

  Serial.println(distance);

  delay(500); // Wait for 500 millisecond(s)

  if (distance < 100) {

    digitalWrite(5, HIGH);

    digitalWrite(4, HIGH);

  } else {

    digitalWrite(5, HIGH);

    digitalWrite(4, LOW);

  }

}

//

int distance = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)

{

  pinMode(triggerPin, OUTPUT);  // Clear the trigger

  digitalWrite(triggerPin, LOW);

  delayMicroseconds(2);

  // Sets the trigger pin to HIGH state for 10 microseconds

  digitalWrite(triggerPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  pinMode(echoPin, INPUT);

  // Reads the echo pin, and returns the sound wave travel time in microseconds

  return pulseIn(echoPin, HIGH);

}

void setup()

{

  Serial.begin(9600);

  pinMode(5, OUTPUT);

  pinMode(4, OUTPUT);

}

void loop()

{

  distance = 0.01723 * readUltrasonicDistance(9, 8);

  Serial.println(distance);

  delay(500); // Wait for 500 millisecond(s)

  if (distance <= 100) {

    digitalWrite(5, HIGH);

    digitalWrite(4, HIGH);

  } else {

    digitalWrite(5, HIGH);

    digitalWrite(4, LOW);

  }

}

long readUltrasonicDistance(int triggerPin, int echoPin)
{
pinMode(triggerPin, OUTPUT); // Clear the trigger
digitalWrite(triggerPin, LOW);
delayMicroseconds(2);
// Sets the trigger pin to HIGH state for 10 microseconds
digitalWrite(triggerPin, HIGH);
delayMicroseconds(10);
digitalWrite(triggerPin, LOW);
pinMode(echoPin, INPUT);
// Reads the echo pin, and returns the sound wave travel time in microseconds
return pulseIn(echoPin, HIGH);
}

void setup()
{
Serial.begin(9600);

pinMode(5, OUTPUT);
pinMode(4, OUTPUT);
pinMode(3, OUTPUT);
pinMode(2, OUTPUT);
}

void loop()
{
Distance = 0.01723 * readUltrasonicDistance(9, 8);
Serial.println(Distance);
delay(500); // Wait for 500 millisecond(s)
if (Distance <= 100) {
digitalWrite(5, HIGH);
digitalWrite(4, HIGH);
digitalWrite(3, HIGH);
digitalWrite(2, HIGH);
} else {
digitalWrite(5, HIGH);
digitalWrite(4, LOW);
digitalWrite(3, HIGH);
digitalWrite(2, LOW);
}
}

long readUltrasonicDistance(int triggerPin, int echoPin)
 {
 pinMode(triggerPin, OUTPUT); // Clear the trigger
 digitalWrite(triggerPin, LOW);
 delayMicroseconds(2);
 // Sets the trigger pin to HIGH state for 10 microseconds
 digitalWrite(triggerPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(triggerPin, LOW);
 pinMode(echoPin, INPUT);
 // Reads the echo pin, and returns the sound wave travel time in microseconds
 return pulseIn(echoPin, HIGH);
 }

void setup()
 {
 Serial.begin(9600);

 pinMode(5, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(6, OUTPUT);
 pinMode(7, OUTPUT);
 }

void loop()
 {
 distance = 0.01723 * readUltrasonicDistance(9, 8);
 Serial.println(distance);
 delay(500); // Wait for 500 millisecond(s)
 if (distance < 100) {
 digitalWrite(5, HIGH);
 digitalWrite(4, HIGH);
 digitalWrite(6, HIGH);
 digitalWrite(7, HIGH);
 } else {
 digitalWrite(5, HIGH);
 digitalWrite(4, LOW);
 digitalWrite(6, HIGH);
 digitalWrite(7, LOW);
 }
 }