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Convert to mm #1

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1d65212
Converted measurements to mm for integer math and added func inRange()
Vishwesh9000 Jan 24, 2026
ad4155b
Changed Serial output into inches and modified timeout for pulseIn
Vishwesh9000 Jan 24, 2026
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60 changes: 30 additions & 30 deletions main.ino
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Original file line number Diff line number Diff line change
@@ -1,62 +1,62 @@
#define PIEZO_PIN 9
#define TRIGGER 6
#define ECHO 7

const int trigger = 6;
const int echo = 7;
float distance;
float dist_inches;
int16_t distance; //In mm

float inch_maxthreshold = 60;
float inch_secondmax = 50;
float inch_medium = 40;
float inch_secondmin = 30;
float inch_min = 20;
int16_t thresholds[] = {51, 508, 762, 1016, 1270, 1524}; //In mm

// Inclusive of both bounds
bool inRange(int16_t var, int16_t min, int16_t max) {
if (var >= min && var <= max) {
return true;
}
return false;
}

void setup() {
Serial.begin(9600);
pinMode(trigger, OUTPUT);
pinMode(echo, INPUT);
pinMode(TRIGGER, OUTPUT);
pinMode(ECHO, INPUT);
pinMode(PIEZO_PIN, OUTPUT);
}

void loop() {
//Creating ultrasonic pulse
digitalWrite(trigger, LOW);
digitalWrite(TRIGGER, LOW);
delayMicroseconds(5);
digitalWrite(trigger, HIGH);
digitalWrite(TRIGGER, HIGH);
delayMicroseconds(10);
digitalWrite(trigger, LOW);
digitalWrite(TRIGGER, LOW);

// Measure duration of echo and calculate distance
distance = pulseIn(echo, HIGH, 38000);
distance = distance * 0.0135;
dist_inches = distance;
// Max: 24000*343/1000/2 = 4116mm = 411.6cm = 162in (HC-SR04 has reliable range of 400cm)
distance = pulseIn(ECHO, HIGH, 24000) * 343/1000/2;

// Determine the tone based on distance thresholds
if (dist_inches > 2 && dist_inches < inch_min) {
if (inRange(distance, thresholds[0], thresholds[1])) {
tone(PIEZO_PIN, 1725);
delay(50);
noTone(PIEZO_PIN);
} else if (dist_inches >= inch_min && dist_inches < inch_secondmin) {
} else if (inRange(distance, thresholds[1], thresholds[2])) {
tone(PIEZO_PIN, 1675);
delay(125);
noTone(PIEZO_PIN);
} else if (dist_inches >= inch_secondmin && dist_inches < inch_medium) {
} else if (inRange(distance, thresholds[2], thresholds[3])) {
tone(PIEZO_PIN, 1550);
delay(150);
noTone(PIEZO_PIN);
} else if (dist_inches >= inch_medium && dist_inches < inch_secondmax) {
} else if (inRange(distance, thresholds[3], thresholds[4])) {
tone(PIEZO_PIN, 1475);
delay(175);
noTone(PIEZO_PIN);
} else if (dist_inches >= inch_secondmax && dist_inches < inch_maxthreshold) {
} else if (inRange(distance, thresholds[4], thresholds[5])) {
tone(PIEZO_PIN, 1400);
delay(225);
noTone(PIEZO_PIN);
}
noTone(PIEZO_PIN);

Serial.print("Distance: ");
Serial.print(dist_inches);
Serial.println(" in");
// Serial.print(distance);
// Serial.println("mm");
Serial.print(distance*5/127);
Serial.println("in");


delay(50);
}