// Define input pin numbers
const int BATTERY_VOLTAGE_PIN = A0;
const int BATTERY_CURRENT_PIN = A1;
const int TIRE_PRESSURE_PIN = A2;
const int SIGNAL_DEVICE_PIN = 2;

// Define output pin numbers
const int RELAY_PIN = 3;
const int LED_PIN = 4;

// Define threshold values
const float BATTERY_POWER_THRESHOLD = 80.0;
const float BATTERY_VOLTAGE_THRESHOLD = 60.0;
const float TIRE_PRESSURE_THRESHOLD = 20.0;

void setup() {
  // Initialize input pins
  pinMode(BATTERY_VOLTAGE_PIN, INPUT);
  pinMode(BATTERY_CURRENT_PIN, INPUT);
  pinMode(TIRE_PRESSURE_PIN, INPUT);
  pinMode(SIGNAL_DEVICE_PIN, INPUT_PULLUP);

  // Initialize output pins
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  // Start serial communication
  Serial.begin(9600);
}

void loop() {
  // Read input values
  float battery_voltage = analogRead(BATTERY_VOLTAGE_PIN) * (5.0 / 1023.0) * 5.0;
  float battery_current = analogRead(BATTERY_CURRENT_PIN) * (5.0 / 1023.0) * 5.0;
  float tire_pressure = analogRead(TIRE_PRESSURE_PIN) * (5.0 / 1023.0) * 100.0;
  bool signal_device_status = digitalRead(SIGNAL_DEVICE_PIN);

  // Check battery power threshold
  float battery_power = battery_voltage * battery_current;
  if (battery_power > BATTERY_POWER_THRESHOLD) {
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("Relay opened due to high battery power");
  } 
  else {
    digitalWrite(RELAY_PIN, LOW);
  }

  // Check battery voltage threshold
  if (battery_voltage > BATTERY_VOLTAGE_THRESHOLD) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("LED turned on due to high battery voltage");
  } else {
    digitalWrite(LED_PIN, LOW);
    
  }

  // Check tire pressure threshold
  if (tire_pressure < TIRE_PRESSURE_THRESHOLD && signal_device_status == LOW) {
    Serial.println("Signal device activated due to low tire pressure");
  }

  // Delay for a short period to avoid excessive loop iterations
  delay(100);
}