People Counter using Arduino and Ultrasonic Sensor

 

Circuit Diagram:

Program Code:

#include <LiquidCrystal_I2C.h> // Call on the libraries

#include <NewPing.h>

#include <Wire.h>

#define TRIGGER_PIN 7 // Ultrasonic sensor trig to Arduino pin 7

#define ECHO_PIN 8 // Ultrasonic sensor echo to Arduino pin 8

#define MAX_DISTANCE 200

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

int LEDPin = 13; // Set LED to pin 13

int distance; // Variable for distance

int people = 0; // Variable for number of people

boolean count = false; // State for counting

LiquidCrystal_I2C lcd(0x20, 16, 2);

void setup() { // Run once to set up the LCD screen and LED

lcd.begin();

lcd.backlight();

pinMode(LEDPin, OUTPUT); // Set the LED as an output

lcd.print("People:"); // Print People: to the LCD screen

}

void loop() { // This loops forever to check for number of people

delay(50);

distance = sonar.ping_cm(); // Ping every 50 milliseconds

// If more than 100 cm away, don't count

if (distance > 100 && count) {

count = false;

digitalWrite(LEDPin, LOW);

}

// If less than 100 cm away, count 1

if (distance < 100 && distance != 0 && !count) {

count = true;

people ++; // Keep adding 1 per count

digitalWrite(LEDPin, HIGH);

lcd.setCursor(10, 0);

lcd.print(people); // Print number of people to LCD screen

}

}

Ultra Sonic Sensor HEX file:

https://drive.google.com/file/d/1PfmGSTwtQHo9-LgflN0eONYtiB1x3fPn/view?usp=sharing