const int ledPin = 13;
const int target = 600;

void setup()
{
	Serial.begin(19200);
	pinMode(ledPin, OUTPUT);
}

bool v = true;

void loop()
{
	int speed = 128;

	while (true) {
		digitalWrite(ledPin, v ? HIGH : LOW);
		v = !v;

		int temp = analogRead(0);
		if (temp < target)
			speed = 255;
		else
			speed = 0;
		analogWrite(9, speed);

		Serial.print("temp = ");
		Serial.print(temp, DEC);
		Serial.print("; speed = ");
		Serial.println(speed, DEC);

		delay(1000);
	}
}