// -----------------------------------------
// Predictive Maintenance Example (Wokwi)
// -----------------------------------------

// Pins
const int vibrationPin = A0;
const int tempPin = A1;
const int ledPin = 13;

// Thresholds (tune as needed)
const int vibThreshold = 600;         // High vibration alert
const float tempThreshold = 60.0;     // High temperature °C

// Moving average window
const int windowSize = 10;
int vibHistory[windowSize];
int indexCount = 0;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);

  // Initialize vibration history
  for (int i = 0; i < windowSize; i++) vibHistory[i] = 0;

  Serial.println("Predictive Maintenance System Started...");
}

void loop() {

  // ----- Read vibration (using Potentiometer) -----
  int vibValue = analogRead(vibrationPin);

  // Moving average filter
  vibHistory[indexCount] = vibValue;
  indexCount = (indexCount + 1) % windowSize;

  long total = 0;
  for (int i = 0; i < windowSize; i++) {
    total += vibHistory[i];
  }
  int vibFiltered = total / windowSize;

  // ----- Read temperature from TMP36 -----
  int rawTemp = analogRead(tempPin);
  float voltage = rawTemp * (5.0 / 1023.0);
  float temperatureC = (voltage - 0.5) * 100.0; // TMP36 equation

  // ----- Print sensor data -----
  Serial.print("Vibration: ");
  Serial.print(vibFiltered);
  Serial.print(" | Temp: ");
  Serial.print(temperatureC);
  Serial.println(" C");

  // ----- Predictive Alerts -----
  bool warning = false;

  if (vibFiltered > vibThreshold) {
    Serial.println("⚠️ Warning: Abnormal vibration detected!");
    warning = true;
  }

  if (temperatureC > tempThreshold) {
    Serial.println("🔥 Warning: Temperature exceeding safe limit!");
    warning = true;
  }

  // LED alert
  digitalWrite(ledPin, warning ? HIGH : LOW);

  delay(500);
}