Smart Glasses

thingiverse

List of Materials - Arduino Nano - Lipo Battery (3.7V 170mA) - Lipo Charger - Buzzer - On/Off Button - Micro USB Port - 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 measurement = distance(maximumRange, minimumRange); playTone(measurement * 10); } int distance(int maxrange, int minrange) { long duration, range; digitalWrite(trigPin,LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); range = duration / 58.2; delay(50); if(range >= maxrange || range <= minrange) return 0; return range; } int playTone(int dly) { tone(buzzerPin, 440); delay(dly); noTone(buzzerPin); delay(dly); }