Social Distancing Alert Wristband Using Arduino (Maker Nano)

NanoDistanceAlert.ino

/*
  Project: Social Distancing Alert Wristband Using Arduino (Maker Nano)
  Board: Arduino Nano (Maker Nano)
  
  Connections:
  Nano | VL53L0X
    5V - VIN
   GND - GND
    A4 - SDA
    A5 - SCL
  
  External libraries:
  - Adafruit VL53L0X V1.0.9 (Manager)
 */

#include "Adafruit_VL53L0X.h"

Adafruit_VL53L0X lox = Adafruit_VL53L0X();

#define BUZZER  8
#define NOTE_E4 330
#define NOTE_G4 392
#define NOTE_B4 494
#define NOTE_D5 587

int pin, ledOn, ledOff;
int note = 0;
int delayMs = 100;
int distance = 0;

void setup()
{
  for (pin = 2; pin < 13; pin++) {
    pinMode(pin, OUTPUT);
  }
  
  Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.

  Serial.println("Adafruit VL53L0X test");
  if (!lox.begin()) {
    Serial.println(F("Failed to boot VL53L0X"));
    while(1);
  }
  // power 
  Serial.println(F("VL53L0X API Simple Ranging example\n\n")); 
}

void loop()
{
  VL53L0X_RangingMeasurementData_t measure;
  
  Serial.print("Reading a measurement... ");
  lox.rangingTest(&measure, false); // pass in 'true' to get debug data printout!

  if (measure.RangeStatus != 4) {  // phase failures have incorrect data
    distance = measure.RangeMilliMeter;
    Serial.print("Distance (mm): ");
    Serial.println(distance);

    if (distance < 300) {
      ledOn = 13;
    }
    else if (distance < 400) {
      ledOn = 12;
    }
    else if (distance < 500) {
      ledOn = 11;
    }
    else if (distance < 600) {
      ledOn = 10;
    }
    else if (distance < 700) {
      ledOn = 8;
    }
    else if (distance < 800) {
      ledOn = 7;
    }
    else if (distance < 900) {
      ledOn = 6;
    }
    else if (distance < 1000) {
      ledOn = 5;
    }
    else if (distance < 1100) {
      ledOn = 4;
    }
    else if (distance < 1200) {
      ledOn = 3;
    }
    ledOff = ledOn;

    for (pin = 2; pin < ledOn; pin++) {
      if (pin != 8) {
        digitalWrite(pin, HIGH);
      }
    }
    for (pin = ledOff; pin < 13; pin++) {
      if (pin != 8) {
        digitalWrite(pin, LOW);
      }
    }

    delayMs = 100;
    if (distance < 500) {
      tone(BUZZER, NOTE_D5, 50);
      delay(50);
      delayMs = 30;
    }
    else if (distance < 600) {
      tone(BUZZER, NOTE_B4, 50);
      delay(50);
      delayMs = 70;
    }
    else if (distance < 800) {
      tone(BUZZER, NOTE_G4, 50);
      delay(50);
      delayMs = 110;
    }
    else if (distance < 1000) {
      tone(BUZZER, NOTE_E4, 70);
      delay(50);
      delayMs = 150;
    }
  }
  else {
    Serial.println(" out of range ");

    for (pin = 2; pin < 13; pin++) {
      if (pin != 8) {
        digitalWrite(pin, LOW);
      }
    }
  }

  delay(delayMs);
}