// LM35 Temperature Sensor Interface with Arduino Uno
// Control Onboard LED based on Temperature Readings

const int sensorPin = A0; // Analog pin connected to LM35
const int ledPin = 13; // Onboard LED pin

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

void loop() {
  // Read temperature from LM35 sensor
  int sensorValue = analogRead(sensorPin);

  // Convert sensor reading to temperature in Celsius
  float temperatureC = (sensorValue * 0.0048828125) * 100.0;

  // Print temperature to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" degrees Celsius");

  // Control onboard LED based on temperature
  if (temperatureC < 30.0) {
    blinkLED(250); // Blink every 250 milliseconds
  } else if (temperatureC >= 30.0) {
    blinkLED(500); // Blink every 500 milliseconds
  }
}

// Function to blink the LED
void blinkLED(int delayTime) {
  digitalWrite(ledPin, HIGH);
  delay(delayTime);
  digitalWrite(ledPin, LOW);
  delay(delayTime);
}