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AURDINO_CODE.cpp
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AURDINO_CODE.cpp
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const int trigPin = 5;
const int echoPin = 18;
const int buzzer = 19;
//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
long duration;
float distanceCm;
float distanceInch;
void setup() {
Serial.begin(115200); // Starts the serial communication
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
pinMode(buzzer,OUTPUT); // Assignment of the buzzer pin to output.
}
void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
digitalWrite(buzzer,LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculate the distance
distanceCm = duration * SOUND_SPEED/2;
// Convert to inches
distanceInch = distanceCm * CM_TO_INCH;
// Prints the distance in the Serial Monitor
Serial.print("Distance (cm): ");
Serial.println(distanceCm);
Serial.print("Distance (inch): ");
Serial.println(distanceInch);
digitalWrite(buzzer,LOW);
if(distanceCm <= 5) //you can change the limit as per your choice
{
digitalWrite(buzzer,HIGH);
tone(buzzer,4000);
}
else
{
noTone(buzzer);
}
delay(1000);
}