arduino.ino

const int IR_SENSOR_PIN = 23;  // Connect IR Out to GPIO 23
const int LED_PIN = 2;         // Built-in LED
const int BUZZER_PIN = 18;     // Connect IR Out to GPIO 18

int counter = 0;
bool objectDetected = false;

void setup() {
  // Higher baud rate for responsive web communication
  Serial.begin(115200);
  
  pinMode(IR_SENSOR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  
  // Flash LED and Beep to signal start
  digitalWrite(LED_PIN, HIGH);
  digitalWrite(BUZZER_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);
}

void loop() {
  int sensorState = digitalRead(IR_SENSOR_PIN);

  // IR sensors usually go LOW when an object is detected
  if (sensorState == LOW && !objectDetected) {
    counter++;
    objectDetected = true;
    
    // Flash built-in LED
    digitalWrite(LED_PIN, HIGH);
    // Beep
    digitalWrite(BUZZER_PIN, HIGH);
    
    // Send data to the HTML dashboard in a simple format
    Serial.print("COUNT:");
    Serial.println(counter);
    
    // Small debounce delay
    delay(100); 
  } 
  
  // Reset detection state when object moves away (sensor goes HIGH)
  if (sensorState == HIGH && objectDetected) {
    objectDetected = false;
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
    Serial.println("STATUS:IDLE");
  }

  // Check for commands FROM the dashboard (e.g., Reset)
  if (Serial.available() > 0) {
    String command = Serial.readStringUntil('\n');
    command.trim();
    if (command == "RESET") {
      counter = 0;
      digitalWrite(LED_PIN, HIGH);
      digitalWrite(BUZZER_PIN, HIGH);
      delay(200);
      digitalWrite(LED_PIN, LOW);
      digitalWrite(BUZZER_PIN, LOW);
      Serial.println("COUNT:0");
    }
  }
}