Introduction: Arduino Ultrasonic Sensor
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);
}
