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Here is the Ultrasonic Sensor device that I created

This device will change the pitch of the buzzer and the amount of LEDs lit up depending on the distance you stand away from it. Enjoy!

Step 1: Step 1: Equipment

- 1 x ultrasonic sensor HC-SR04

- 6 x LED s (2 x green, 2 x red, 2 x yellow)

- 13 x jumper wires

- 1 x buzzer

- 7 x 220 ohm resistors

Step 2: Step 2: Connections

Connect all of the components to look the same as the image above.

Ports 13-8 are the LEDs

Ports 7,6 is the Ultrasonic Sensor

Port 3 is the buzzer

Step 3: Step 3: Code

The final product should work like this ^^ and below is the code.

#define trigPin 7

#define echoPin 6

#define led 13

#define led2 12

#define led3 11

#define led4 10

#define led5 9

#define led6 8

#define buzzer 3

int sound = 250;

void setup() {

Serial.begin (9600);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(led, OUTPUT);

pinMode(led2, OUTPUT);

pinMode(led3, OUTPUT);

pinMode(led4, OUTPUT);

pinMode(led5, OUTPUT);

pinMode(led6, OUTPUT);

pinMode(buzzer, OUTPUT);

}

void loop() {

long duration, distance;

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (duration/2) / 49.1;

if (distance <= 50) {

digitalWrite(led, HIGH);

sound = 250;

for (int i=0; i<500; i++) { // generate a 1KHz tone for 1/2 second

digitalWrite(buzzer, HIGH);

delayMicroseconds(500);

digitalWrite(buzzer, LOW);

delayMicroseconds(500);

}

}

else {

digitalWrite(led,LOW);

}

if (distance < 45) {

digitalWrite(led2, HIGH);

sound = 260;

}

else {

digitalWrite(led2, LOW);

}

if (distance < 40) {

digitalWrite(led3, HIGH);

sound = 270;

}

else {

digitalWrite(led3, LOW);

}

if (distance < 35) {

digitalWrite(led4, HIGH);

sound = 280;

}

else {

digitalWrite(led4,LOW);

}

if (distance < 30) {

digitalWrite(led5, HIGH);

sound = 290;

}

else {

digitalWrite(led5,LOW);

}

if (distance < 25) {

digitalWrite(led6, HIGH);

sound = 300;

}

else {

digitalWrite(led6,LOW);

}

if (distance > 50 || distance <= 0){

Serial.println("Out of range");

noTone(buzzer);

}

else {

Serial.print(distance);

Serial.println(" cm");

tone(buzzer, sound);

}

delay(500);

}

<p>Great intructable ^_^ Here's mine: <a href="https://youtu.be/tl9uDUr10xY?list=PLUf1E7DXqsCvVQ56yFzpO1OO22iZPvi5-" rel="nofollow">https://youtu.be/tl9uDUr10xY?list=PLUf1E7DXqsCvVQ56yFzpO1OO22iZPvi5-</a></p>
<p>Nice! What do you use it for?</p>
<p>Hi! </p><p>I intended it to be used for sensing if someone walked outside of the door to my bedroom :) </p>

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