objectCounter_and_Timer

#include <TimerOne.h>

// Define the sensor pins
#define TRANSMITTER_PIN 9  // IR Transmitter pin. Needs to be 9 or 10 due to Timer1 usage
#define RECEIVER_PIN 2     // IR Receiver pin

int counter = 0;   // Object counter
int lastState = HIGH;  // Last detected IR state

void setup() {
  pinMode(RECEIVER_PIN, INPUT);
  pinMode(TRANSMITTER_PIN, OUTPUT);

  // Setup 38 kHz carrier frequency on the TRANSMITTER_PIN with Timer1
  Timer1.initialize(26);  // initialize Timer1, and set a 1/2 period of 26 microseconds = 38.5kHz
  Timer1.pwm(TRANSMITTER_PIN, 512);  // setup pwm on pin TRANSMITTER_PIN, 50% duty cycle

  Serial.begin(9600);  // Open serial connection
}

void loop() {
  int currentState = digitalRead(RECEIVER_PIN);  // Read the current state of the receiver

  // Check if the beam was broken
  if (lastState == HIGH && currentState == LOW) {
    counter++;  // Increment the counter
    Serial.println("Object detected!");
    Serial.print("Total number of objects detected: ");
    Serial.println(counter);
  }

  lastState = currentState;  // Update the last state

  delay(100);  // Delay to avoid multiple detection of the same object
}