
Tutorial for above is here.
Tried the first time and fried my usb-c, wasn’t reading that I needed to ground them… Now it works 🙂 Adjusted the frequency much higher for nicer sounding tones. Tried to use the frequency for notes C – G, and it sounded pretty jarring to the ears. The electronic buzzer obviously cannot compare to the piano.
#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 = 5550;
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) / 29.1;
if (distance <= 30) {
digitalWrite(led, HIGH);
sound = 5550;
}
else {
digitalWrite(led,LOW);
}
if (distance < 25) {
digitalWrite(led2, HIGH);
sound = 9250;
}
else {
digitalWrite(led2, LOW);
}
if (distance < 20) {
digitalWrite(led3, HIGH);
sound = 11200;
}
else {
digitalWrite(led3, LOW);
}
if (distance < 15) {
digitalWrite(led4, HIGH);
sound = 12500;
}
else {
digitalWrite(led4,LOW);
}
if (distance < 10) {
digitalWrite(led5, HIGH);
sound = 13500;
}
else {
digitalWrite(led5,LOW);
}
if (distance < 5) {
digitalWrite(led6, HIGH);
sound = 15000;
}
else {
digitalWrite(led6,LOW);
}
if (distance > 30 || distance <= 0){
Serial.println("Out of range");
noTone(buzzer);
}
else {
Serial.print(distance);
Serial.println(" cm");
// tone( pin number, frequency in hertz, duration in milliseconds);
tone(buzzer, sound);
}
delay(500);
}