Bi-Directional Visitor Counter using single ultrasonic sensor with LCD
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LIST OF COMPONENT (affiliate links)
amzn.to/2fvSRJq (Arduino)
amzn.to/2yBk7eT (LCD display)
amzn.to/2zg8aeX (I2C)
amzn.to/2vmUlLw (Ultrasonic sensor)
amzn.to/2wxPmWz (Breadboard)
amzn.to/2vJ3lvo (Jumper wire)
#include (Wire.h) //instead of parenthesis () put angle bracket as UKposts description does not allow angle bracket
#include (LiquidCrystal_I2C.h)
#define trigPin 13
#define echoPin 12
// Find LCD address for I2C in this tutorial it is 0x3f
LiquidCrystal_I2C lcd(0x3f, 16, 2);
int counter = 0;
int currentState1 = 0;
int previousState1 = 0;
int currentState2 = 0;
int previousState2 = 0;
int inside = 0;
int outside = 0;
void setup()
{
// initialize the LCD
lcd.begin();
//Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop()
{
lcd.setCursor(0, 0);
lcd.print("IN: ");
lcd.setCursor(8, 0);
lcd.print("OUT: ");
lcd.setCursor(0, 1);
lcd.print("Total Inside: ");
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if (distance (= 9){
currentState1 = 1;
}
else {
currentState1 = 0;
}
delay(100);
if(currentState1 != previousState1){
if(currentState1 == 1){
counter = counter + 1;}
lcd.setCursor(14, 1);
lcd.print(counter);
inside = inside +1;}
lcd.setCursor(4, 0);
lcd.print(inside);
if (distance ) 9 && distance (= 18){
currentState2 = 1;
}
else {
currentState2 = 0;
}
delay(100);
if(currentState2 != previousState2){
if(currentState2 == 1){
counter = counter - 1;}
lcd.setCursor(14, 1);
lcd.print(counter);
outside = outside +1;}
lcd.setCursor(13, 0);
lcd.print(outside);
lcd.setCursor(14, 1);
lcd.print(counter);
if (counter ) 9 || counter ( 0){
lcd.setCursor(14, 1);
lcd.print(counter);
delay(100);
lcd.clear();
}
}