Nipun Jyoti Pathak
Published

Bidirectional Visitor Counter System

This System measures the flow of people entering or leaving a room. Also gives information on how many people are inside the room.

IntermediateFull instructions provided1 hour645
Bidirectional Visitor Counter System

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
Bolt WiFi Module
Bolt IoT Bolt WiFi Module
×1
Ultrasonic Sensor - HC-SR04 (Generic)
Ultrasonic Sensor - HC-SR04 (Generic)
×2
LED (generic)
LED (generic)
×2
Jumper wires (generic)
Jumper wires (generic)
×1
Resistor 100 ohm
Resistor 100 ohm
×2

Software apps and online services

Arduino IDE
Arduino IDE
Twilio API for WhatsApp
Twilio API for WhatsApp

Story

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Schematics

Circuit Diagram of The System

Code

Arduino Code

Arduino
void(* resetFunc) (void) = 0; //declaring reset func at address 0
//defining the pins
#define trig2 5
#define echo2 6
#define trig1 7
#define echo1 8
#define entryLight 11
#define exitLight 9
#define GND 10

int  d1, d2, distance, i, j, p, q, a = 0;
long int duration;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trig1, OUTPUT);
  pinMode(echo1, INPUT);
  pinMode(trig2, OUTPUT);
  pinMode(echo2, INPUT);
  pinMode(entryLight, OUTPUT);
  pinMode(exitLight, OUTPUT);
  pinMode(GND, OUTPUT);
}


void loop() {
  // put your main code here, to run repeatedly:
  a++;
  Ultrasonic(trig1, echo1);
  d1 = distance;

  Ultrasonic(trig2, echo2);
  d2 = distance;

  if(d1 <= 20)
  {
    digitalWrite(entryLight, HIGH);
    i++;
    if(i == 1)
    {
      p++;
    }
    else
    {
      p;
    }
  }
  else
  {
    i = 0;
    digitalWrite(entryLight, LOW);
  }
  if(d2 <= 20)//if distance is less than or equal to 20
  {
    digitalWrite(exitLight, HIGH);//
    digitalWrite(GND, LOW);
    j++;
    if(j == 1)
    {
      q++;
    }
    else
    {
      q;
    }
  }
  else
  {
    j = 0;
    digitalWrite(exitLight, LOW);
    digitalWrite(GND, LOW);
  }
  // Serial.println(p);
  // Serial.println(q);
  if((p - q) < 0)
  {
    resetFunc();    
  }
  if(a%200 == 0) //print after every 20 seconds
  {
    Serial.print("Persons Entered = ");
    Serial.print(p);
    Serial.print(", Persons Exit = ");
    Serial.print(q);
    Serial.print(", Total Persons in the Room = ");
    Serial.println(p - q);
  }
  delay(100);
}



void Ultrasonic(int trig, int echo)
{
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  distance = 0.034 * duration/2;
}

Python Code

Python
from boltiot import Bolt, Sms #Import Sms and Bolt class from boltiot library
import json, time, datetime

SID = 'You can find SID in your Twilio Dashboard' 
AUTH_TOKEN = 'You can find  on your Twilio Dashboard' 
FROM_NUMBER = 'whatsapp:This is the no. generated by Twilio. You can find this on your Twilio Dashboard'
TO_NUMBER = 'whatsapp:This is your number. Make sure you are adding +91 in beginning'
API_KEY = 'This is your Bolt Cloud accout API key'
DEVICE_ID = 'This is the ID of your Bolt device'


bolt = Bolt(API_KEY, DEVICE_ID)
sms = Sms(SID, AUTH_TOKEN, TO_NUMBER, FROM_NUMBER)
while True:
    data = json.loads(bolt.serialRead('10'))['value']
    print(data) 
    try:
        print("Sending message...")
        response = sms.send_sms(data)
        time.sleep(10)
    except Exception as e:
        print("Error occurred: Below are the details")
        print(e)
    time.sleep(10)

Credits

Nipun Jyoti Pathak

Nipun Jyoti Pathak

2 projects • 1 follower
I am pursuing B.Tech in Electrical Engineering. I am still learning about machine learning, neural networks, IoT and game development.

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  • Twilio