#define LED_ALERT  PA5
#define LED_NORMAL PA6

const float THRESHOLD_HIGH = 40.0;

float currentTemp = 25.0;
bool  tempRising  = true;
int   messageCount = 0;

void setup() {
  Serial.begin(9600);
  pinMode(LED_ALERT,  OUTPUT);
  pinMode(LED_NORMAL, OUTPUT);
  digitalWrite(LED_ALERT,  LOW);
  digitalWrite(LED_NORMAL, LOW);
}

void loop() {
  messageCount++;

  // Simulate temperature wave 20C to 55C
  if (tempRising)
  {
    currentTemp += 1.5;
    if (currentTemp >= 55.0) tempRising = false;
  } 
  else {
    currentTemp -= 1.5;
    if (currentTemp <= 20.0) tempRising = true;
  }

  // Determine alert status
  bool isAlert = (currentTemp > THRESHOLD_HIGH);

  if (isAlert == true) {
    digitalWrite(LED_ALERT,  HIGH);  // RED on
    digitalWrite(LED_NORMAL, LOW);   // GREEN off
  } else {
    digitalWrite(LED_ALERT,  LOW);   // RED off
    digitalWrite(LED_NORMAL, HIGH);  // GREEN on
  }

  // Send UART message
  Serial.print("[MSG ");
  if (messageCount < 10) Serial.print("0");
  Serial.print(messageCount);
  Serial.print("] ");
  Serial.print("TEMP: ");
  Serial.print(currentTemp, 1);
  Serial.print(" C  |  STATUS: ");
  if (isAlert) {
    Serial.println("*** WARNING — OVER TEMPERATURE ***  |  LED: RED ON");
  } else {
    Serial.println("Normal  |  LED: GREEN ON");
  }

  delay(800);
}