DistCap

#define trigPin 2 // Set trig as pin 2
#define echoPin 3 // Set echo as pin 3

#define LED 4 // Set LED as pin 4

#define buzzer 5 // Set buzzer as pin 5

void setup()

{
  
Serial.begin (9600); //Serial Port begin

pinMode(trigPin, OUTPUT); // Set trigpin - pin 2 as an output

pinMode(echoPin, INPUT); // Set echopin - pin 3 as an output

pinMode (LED, OUTPUT); // Set LED - pin 4 as an output

pinMode(buzzer, OUTPUT); // Set buzzer - pin 5 as an output
}


void loop()

{

// Variable for defining duration and distance
int duration, distance; 

// The sensor is trigered by a HIGH pulse during 500 microseconds

digitalWrite(trigPin, HIGH); 

delayMicroseconds(500); 

digitalWrite(trigPin, LOW); 


// Convert the time into a distance

duration = pulseIn(echoPin, HIGH); 

distance = (duration/2) / 29.1; 

if (distance < 150) // If the distance is less than 1.5 meters the code down will execute

{

digitalWrite(LED, HIGH); // Turn on LED
tone(buzzer, 1000); // Start buzzer sound

}

else

{
  digitalWrite(LED, LOW); // Turn off LED
  noTone(buzzer);     // Stop buzzer sound
}
}