PROBLEM AND HOW WE FIXED IT

Team Xenobotics: aryamansingh207, lakshyabajaj14, vinodpuniaae, arjunshelat

Published July 14, 2020

SD-Card (Social Distancing ICard)

A device that maintains social distancing, this device buzzes when a person is 6 feet or less away from you..

BeginnerFull instructions provided1,074

Things used in this project

Hardware components

Buzzer, Piezo

5 mm LED: Red

5 mm LED: Green

Ultrasonic Sensor - HC-SR04 (Generic)

SG90 Micro-servo motor

Arduino Nano R3

9V battery (generic)

Jumper wires (generic)

9V Battery Clip

SparkFun Pushbutton switch 12mm

Software apps and online services

Arduino IDE

Story

THE STORY OF SD-CARD

Our project is about a device that maintains social distancing.

The Beginning for innovation

Once the schools and offices reopen it will increase the risk of getting COVID-19. The only way we can decrease this risk is by maintaining social distancing. We started brainstorming on solutions through which we can make a device that not only maintains social distancing but is portable at the same time. Due to lockdown, we were limited with the resources available with us and hence we had to build something easily available. We started off something that can be easily implemented with less use of hands. We researched a lot and studied different kinds of sensors that can calculate the distance between 2 or more bodies. We studied from different sensor guide books and watched videos on YouTube from the channel of Arduino.

HOW THE-CARD WORKS

After a week of research, brainstorming and studying we ended up making, the SD-CARD (social distancing card). The SD-CARD consists of an Arduino Nano which is connected with a buzzer, an ultrasonic sensor and 2 LEDs. The ultrasonic sensor calculates the distance between the person wearing it and people near him/her. If the person is not maintaining social distancing i.e. if the person is less than 6 feet apart then the buzzer will start buzzing and alert the person. There are two LEDs red and green. Red LED turns on when social distancing isn't maintained and greed LED turns on when the distance is maintained. The entire device is powered by a 9V battery connected with a slide-switch too

PROBLEM AND HOW WE FIXED IT

In our prototype, the ultrasonic sensor was always on and so was the LED. The Arduino Nano was directly connected to a battery which gave it a constant supply because of which it was always.

We couldn't keep the SD-CARD always on so we decided to add a slide-switch. Like this, if you want to turn your SD-CARD off you can do so just by using the switch.

HOW WE CREATED OUR CIRCUIT

We used Autodesk Tinkercad to make our circuit and check our code. After testing our circuit on Tinkercad it was time to perform it in real life. We used ARDUINO IDE software to upload the code into the Arduino Nano.

Visit our website: https://pramitranjan1106.wixsite.com/sd-card

Schematics

Code

SD- Card Code

# define buz 2
#include <Servo.h>
Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position


int dis = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  // Sets the trigger pin to HIGH state for 10 microseconds
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  // Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin, HIGH);
}

void setup()
{
  pinMode(8, OUTPUT); //defines pins as input or output 
  pinMode(6, OUTPUT);
  pinMode(buz, OUTPUT);
  myservo.attach(12);  // attaches the servo on pin 9 to the servo object
}

void loop()
{
  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
  dis = 0.01723 * readUltrasonicDistance(13, A0);// testing if distance is less than 6 feet
  if (dis < 182) {
    digitalWrite(8, HIGH);
    digitalWrite(6, LOW);
    tone(buz,60);
  } else {
    digitalWrite(8, LOW);
    digitalWrite(6, HIGH);
    noTone(buz);
  }
  delay(10); // Delay a little bit to improve simulation performance
}

SD-Card (Social Distancing ICard)