// STM32 Nucleo-C031C6 I2C Example
// Simulation: https://wokwi.com/projects/365421666018061313

#define METAL_SENSOR_PIN A0
#define ALERT_LED_PIN    D13     // Red LED
#define MOTOR1_LED_PIN   D6      // Motor LED 1 (Green)
#define MOTOR2_LED_PIN   D5      // Motor LED 2 (Green)
#define MOTOR3_LED_PIN   D4      // Motor LED 3 (Green)
#define BUZZER_PIN       D9      // Buzzer

void setup() {
  pinMode(ALERT_LED_PIN, OUTPUT);
  pinMode(MOTOR1_LED_PIN, OUTPUT);
  pinMode(MOTOR2_LED_PIN, OUTPUT);
  pinMode(MOTOR3_LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  Serial.begin(115200);
  Serial.println("Landmine Detection System Started");
}

void loop() {
  int sensorValue = analogRead(METAL_SENSOR_PIN);
  Serial.println(sensorValue);

  if (sensorValue > 1000) {
    // METAL DETECTED
    digitalWrite(ALERT_LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);

    // Motors STOP
    digitalWrite(MOTOR1_LED_PIN, LOW);
    digitalWrite(MOTOR2_LED_PIN, LOW);
    digitalWrite(MOTOR3_LED_PIN, LOW);
  } else {
    // NO METAL
    digitalWrite(ALERT_LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);

    // Motors RUN
    digitalWrite(MOTOR1_LED_PIN, HIGH);
    digitalWrite(MOTOR2_LED_PIN, HIGH);
    digitalWrite(MOTOR3_LED_PIN, HIGH);
  }

  delay(300);
}