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ultrasonicalarm.ino
47 lines (32 loc) · 770 Bytes
/
ultrasonicalarm.ino
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#define trigPin 2
#define echoPin 3
#define ledPin 7
#define buzzerPin 8
void setup() {
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(ledPin, OUTPUT);
pinMode(buzzerPin, OUTPUT);
}
void loop() {
long duration, distance_cm;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance_cm = duration / 58;
Serial.print("Distance: ");
Serial.print(distance_cm);
Serial.println(" cm");
if (distance_cm < 100) {
digitalWrite(ledPin, HIGH);
tone(buzzerPin, 1000);
} else {
digitalWrite(ledPin, LOW);
noTone(buzzerPin);
}
delay(200);
}