const int ledPin = 13;

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

bool v = true;

void run(int speed) {
	digitalWrite(ledPin, v ? HIGH : LOW);
	v = !v;
	analogWrite(9, speed);

	int val = analogRead(0);
	Serial.print(val, DEC);
	Serial.print(" -> ");
	Serial.println(speed, DEC);

	delay(1000);
}

void loop()
{
	for (int i = 60; i < 255; i += 5) {
		run(i);
	}
	run(255);
	for (int i = 250; i > 60; i -= 5) {
		run(i);
	}
}