Smart Glasses

List of materials
-Arduino nano
-Lipo (3.7V 170mA)
-Lipo charger
-Buzzer
-On / Off Button
-Micro USB
-HC SR04 Ultrasonic Sensor

Arduino Code:

#define echoPin 13
#define trigPin 12
#define buzzerPin 2

int maximumRange = 50;
int minimumRange = 0;



void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(buzzerPin, OUTPUT);

}

void loop() {

int olcum = mesafe(maximumRange, minimumRange);
melodi(olcum*10);

}

int mesafe(int maxrange, int minrange)
{
long duration, distance;

digitalWrite(trigPin,LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distance = duration / 58.2;
delay(50);

if(distance >= maxrange || distance